**Coldfire ** has given me the best laugh of the day with the *lil old lady who * joke.
Here is one that I made up:
KK
WT
Owen.
Owen Who?
(singing)Owen to the chapel and we’re gunna get married.
*Thank you, thank you very much. I’d like to thank the Academy for this Nobel Prize for Best Knock Knock Joke. *
Tee hee… the panther one always makes me giggle. 
KK
WT?
Thumping
Thumping Who?
Thumping thlimy is on your leg.
KK
WT?
Stan
Stan Who?
Stan back, I’m going to sneeze!
KK
WT?
Heaven
Heaven Who?
Heaven you heard enough knock-knock jokes?
ok, my mom made this one up:
Knock knock.
Who’s there?
Ayatollah Khomeini.
Ayatollah Khomeini who?
Ayatollah Khomeini whena you come over to MY house, how come you no me tella come-in-y whena I come over to YOUR house?
hmm, never wrote it down before – probably works best audibly…
My favorite KK for Kids:
KK
WT
Tickem
Tickem Who?
(Pointing index finger, as if its a gun) Tickem Up! I’m a Tongue Tied Towboy (as in Cowboy)
KK
WT
Duane
Duane Who?
Duane de bathtub! I’m dwowning!
knock-a, knock-a
who’s-a there-a?
me-a
me-a who-a?
yes you are
Ah, your son wouldn’t get it.
Knock, knock.
Who’s there?
Sam and Janet.
Sam and Janet who?
Sam and Janet evening.
Knock knock.
Who’s there?
Joe.
Joe who?
Joe mama!
Gets 'em every time.