S03E21: I Know That You Know
When Sondra and Elvin announce their engagement, Clair and the children use the news to play a practical joke on Cliff, who launches a counter-offensive of his own.
Previous Episode 
Season 1
Pilot / Theo's Economic Lesson
S1E1 / 20 Sep 1984
Mr. Fish (a.k.a. Goodbye, Mr. Fish)
S1E2 / 27 Sep 1984
Bad Dreams
S1E3 / 04 Oct 1984
Is That My Boy?
S1E4 / 11 Oct 1984
A Shirt Story
S1E5 / 18 Oct 1984
Breaking With Tradition
S1E6 / 25 Oct 1984
One More Time
S1E7 / 01 Nov 1984
Play It Again, Vanessa
S1E8 / 08 Nov 1984
How Ugly Is He?
S1E9 / 15 Nov 1984
Bonjour, Sondra
S1E10 / 22 Nov 1984
You're Not a Mother Night
S1E11 / 06 Dec 1984
Rudy's Sick
S1E12 / 13 Dec 1984
Father's Day
S1E13 / 20 Dec 1984
Independence Day
S1E14 / 10 Jan 1985
Physician of the Year
S1E15 / 17 Jan 1985
Jitterbug Break
S1E16 / 31 Jan 1985
Theo and the Joint
S1E17 / 07 Feb 1985
Vanessa's New Class
S1E18 / 14 Feb 1985
Clair's Case
S1E19 / 21 Feb 1985
Back to the Track, Jack
S1E20 / 28 Feb 1985
The Younger Woman
S1E21 / 14 Mar 1985
Slumber Party
S1E22 / 28 Mar 1985
Mr. Quiet
S1E23 / 02 May 1985
Cliff's Birthday
S1E24 / 09 May 1985
Season 2
First Day of School
S2E1 / 26 Sep 1985
The Juicer
S2E2 / 03 Oct 1985
Happy Anniversary
S2E3 / 10 Oct 1985
Cliff in Love
S2E4 / 17 Oct 1985
Theo and the Older Woman
S2E5 / 24 Oct 1985
Halloween
S2E6 / 31 Oct 1985
Rudy Suits Up
S2E7 / 07 Nov 1985
Denise Drives
S2E8 / 14 Nov 1985
Clair's Sister
S2E9 / 21 Nov 1985
Clair's Toe
S2E10 / 05 Dec 1985
Denise's Friend
S2E11 / 12 Dec 1985
Mrs. Westlake
S2E12 / 02 Jan 1986
The Auction
S2E13 / 09 Jan 1986
Vanessa's Bad Grade
S2E14 / 16 Jan 1986
Theo and Cockroach
S2E15 / 30 Jan 1986
The Dentist
S2E16 / 02 Feb 1986
Play It Again, Russell
S2E17 / 13 Feb 1986
A Touch of Wonder
S2E18 / 20 Feb 1986
Full House
S2E19 / 27 Feb 1986
Close to Home
S2E20 / 13 Mar 1986
An Early Spring
S2E21 / 20 Mar 1986
Theo's Holiday
S2E22 / 03 Apr 1986
The Card Game
S2E23 / 10 Apr 1986
Off to the Races
S2E24 / 08 May 1986
Denise's Decision
S2E25 / 15 May 1986
Season 3
Bring 'em Back Alive
S3E1 / 25 Sep 1986
Food for Thought
S3E2 / 02 Oct 1986
Golden Anniversary
S3E3 / 09 Oct 1986
Man Talk
S3E4 / 16 Oct 1986
Mother, May I?
S3E5 / 23 Oct 1986
The March
S3E6 / 30 Oct 1986
Theo's Flight
S3E7 / 06 Nov 1986
Vanessa's Rich
S3E8 / 13 Nov 1986
Denise Gets a D
S3E9 / 20 Nov 1986
A Girl and Her Dog
S3E10 / 04 Dec 1986
War Stories
S3E11 / 11 Dec 1986
Cliff in Charge
S3E12 / 18 Dec 1986
Monster Man Huxtable
S3E13 / 08 Jan 1987
Rudy Spends the Night
S3E14 / 15 Jan 1987
Say Hello to a Good Buy
S3E15 / 22 Jan 1987
Denise Gets an Opinion
S3E16 / 05 Feb 1987
Calling Doctor Huxtable
S3E17 / 12 Feb 1987
You Only Hurt the One You Love
S3E18 / 19 Feb 1987
The Shower
S3E19 / 26 Feb 1987
Cliff's 50th Birthday
S3E20 / 12 Mar 1987
I Know That You Know
S3E21 / 19 Mar 1987
Andalusian Flu
S3E22 / 02 Apr 1987
Bald and Beautiful
S3E23 / 09 Apr 1987
Planning Parenthood
S3E24 / 30 Apr 1987
Hillman
S3E25 / 07 May 1987
Season 4
Call of the Wild
S4E1 / 24 Sep 1987
Theogate
S4E2 / 01 Oct 1987
It's Not Easy Being Green
S4E3 / 08 Oct 1987
Cliff's Mistake
S4E4 / 15 Oct 1987
Shakespeare
S4E5 / 22 Oct 1987
That's Not What I Said
S4E6 / 29 Oct 1987
Autumn Gifts
S4E7 / 05 Nov 1987
Looking Back
S4E8 / 12 Nov 1987
Where's Rudy?
S4E9 / 19 Nov 1987
Dance Mania
S4E10 / 03 Dec 1987
The Locker Room
S4E11 / 10 Dec 1987
The Show Must Go On
S4E12 / 17 Dec 1987
Bookworm
S4E13 / 07 Jan 1988
Twinkle, Twinkle Little Star
S4E14 / 14 Jan 1988
The Visit
S4E15 / 21 Jan 1988
The Drum Major
S4E16 / 04 Feb 1988
Waterworks
S4E17 / 11 Feb 1988
Once Upon a Time
S4E18 / 18 Feb 1988
Petanque
S4E19 / 25 Feb 1988
Trust Me
S4E20 / 03 Mar 1988
Home for the Weekend
S4E21 / 17 Mar 1988
The Prom
S4E22 / 24 Mar 1988
Gone Fishin'
S4E23 / 28 Apr 1988
Season 5
Together Again and Again
S5E1 / 06 Oct 1988
The Physical
S5E2 / 13 Oct 1988
Rudy's All-Nighter
S5E3 / 20 Oct 1988
Move It (a.k.a. The Baby Game)
S5E4 / 27 Oct 1988
Out of Brooklyn
S5E5 / 03 Nov 1988
The Birth
S5E6 / 10 Nov 1988
Cyranoise de Bergington
S5E7 / 17 Nov 1988
How Do You Get to Carnegie Hall?
S5E8 / 01 Dec 1988
If the Dress Fits, Wear It
S5E9 / 08 Dec 1988
Is There a Hamster in the House?
S5E10 / 15 Dec 1988
Truth or Consequences
S5E11 / 05 Jan 1989
Cliff Babysits
S5E12 / 12 Jan 1989
Mrs. Huxtable Goes to Kindergarten
S5E13 / 26 Jan 1989
The Lost Weekend
S5E14 / 02 Feb 1989
No Way, Baby
S5E15 / 06 Feb 1989
Can I Say Something, Please?
S5E16 / 09 Feb 1989
The Dead End Kids Meet Dr. Lotus
S5E17 / 16 Feb 1989
The Boys of Winter
S5E18 / 23 Feb 1989
It Comes and It Goes
S5E19 / 09 Mar 1989
Theo's Women
S5E20 / 16 Mar 1989
Birthday Blues
S5E21 / 30 Mar 1989
A Room With No View
S5E22 / 13 Apr 1989
What He Did for Love
S5E23 / 27 Apr 1989
Day of the Locusts
S5E24 / 04 May 1989
57 Varieties
S5E25 / 11 May 1989
Season 6
Denise: The Saga Continues
S6E1 / 21 Sep 1989
Surf's Up
S6E2 / 28 Sep 1989
I'm 'In' With the 'In' Crowd
S6E3 / 05 Oct 1989
Denise Kendall: Navy Wife
S6E4 / 12 Oct 1989
Theo's Gift
S6E5 / 19 Oct 1989
Denise Kendall: Babysitter
S6E6 / 26 Oct 1989
Shall We Dance?
S6E7 / 02 Nov 1989
The Day the Spores Landed
S6E8 / 09 Nov 1989
Cliff's Wet Adventure
S6E9 / 16 Nov 1989
Grampy and Nu-Nu Visit the Huxtables
S6E10 / 30 Nov 1989
Cliff la Dolce
S6E11 / 07 Dec 1989
Getting to Know You
S6E12 / 14 Dec 1989
Elvin Pays for Dinner
S6E13 / 04 Jan 1990
Cliff's Nightmare
S6E14 / 11 Jan 1990
Denise Kendall: Singles Counselor
S6E15 / 18 Jan 1990
The Birthday Party
S6E16 / 25 Jan 1990
Not Everybody Loves the Blues
S6E17 / 01 Feb 1990
Rudy's Walk on the Wild Side
S6E18 / 08 Feb 1990
Mr. Sandman
S6E19 / 15 Feb 1990
Isn't It Romantic?
S6E20 / 22 Feb 1990
Theo's Dirty Laundry
S6E21 / 15 Mar 1990
What's It All About?
S6E22 / 22 Mar 1990
Off to See the Wretched
S6E23 / 05 Apr 1990
The Moves
S6E24 / 19 Apr 1990
Live and Learn
S6E25 / 26 Apr 1990
The Storyteller
S6E26 / 03 May 1990
Season 7
Same Time Next Year
S7E1 / 20 Sep 1990
Bird in the Hand
S7E2 / 27 Sep 1990
The Last Barbecue
S7E3 / 04 Oct 1990
Period of Adjustment
S7E4 / 11 Oct 1990
It's All in the Game
S7E5 / 18 Oct 1990
Getting the Story
S7E6 / 25 Oct 1990
Just Thinking About It
S7E7 / 01 Nov 1990
The Infantry Has Landed (and They've Fallen Off the Roof)
S7E8 / 08 Nov 1990
You Can Go Home Again
S7E9 / 15 Nov 1990
It's a Boy
S7E10 / 29 Nov 1990
Clair's Liberation
S7E11 / 06 Dec 1990
It's Your Move
S7E12 / 13 Dec 1990
Theo's Final Final
S7E13 / 03 Jan 1991
Attack of the Killer B's
S7E14 / 10 Jan 1991
Total Control
S7E15 / 31 Jan 1991
Adventures in Babysitting
S7E16 / 07 Feb 1991
27 and Still Cooking
S7E17 / 14 Feb 1991
The Return of the Clairettes
S7E18 / 21 Feb 1991
No More Mr. Nice Guy
S7E19 / 28 Feb 1991
Home Remedies
S7E20 / 07 Mar 1991
Nightmare on Stigwood Avenue
S7E21 / 21 Mar 1991
There's Still No Joy in Mudville
S7E22 / 04 Apr 1991
Cliff and Jake
S7E23 / 11 Apr 1991
Theo and the Kids (1)
S7E24 / 25 Apr 1991
Theo and the Kids (2)
S7E25 / 02 May 1991
Season 8
With This Ring?
S8E1 / 19 Sep 1991
There's No Place Like This Home
S8E2 / 26 Sep 1991
Particles in Motion
S8E3 / 03 Oct 1991
Pam Applies to College
S8E4 / 10 Oct 1991
Warning: A Double-Lit Candle Can Cause a Meltdown
S8E5 / 17 Oct 1991
It's Apparent to Everyone
S8E6 / 24 Oct 1991
The Iceman Bricketh
S8E7 / 31 Oct 1991
Olivia's Field Trip
S8E8 / 07 Nov 1991
For Men Only
S8E9 / 14 Nov 1991
Olivia Comes Out of the Closet
S8E10 / 21 Nov 1991
Two Is a Crowd
S8E11 / 05 Dec 1991
Clair's Place
S8E12 / 19 Dec 1991
Theo's Future
S8E13 / 02 Jan 1992
The Price Is Wrong
S8E14 / 09 Jan 1992
Bring Me the Lip Gloss of Deirdre Arpelle
S8E15 / 16 Jan 1992
Eat, Drink and Be Wary
S8E16 / 30 Jan 1992
The Getaway
S8E17 / 06 Feb 1992
Cliff Gets Jilted
S8E18 / 06 Feb 1992
Cliff and Theo Come Clean
S8E19 / 13 Feb 1992
Clair's Reunion
S8E20 / 20 Feb 1992
Rudy's Retreat
S8E21 / 27 Feb 1992
You Can't Stop the Music
S8E22 / 26 Mar 1992
Some Gifts Aren't Deductible
S8E23 / 23 Apr 1992
And So We Commence
S8E24 / 30 Apr 1992
Bill Cosby
Heathcliff Huxtable
Phylicia Rashād
Clair Huxtable
Malcolm-Jamal Warner
Theo Huxtable
Tempestt Bledsoe
Vanessa Huxtable
Keshia Knight Pulliam
Rudy Huxtable
Sabrina Le Beauf
Sondra Huxtable
Geoffrey Owens
Elvin Tibideaux
