I will read or show the provided responses to my kid after closing, and ask her to pick the funniest.
Small print: I won't submit jokes myself. I may censor responses at my discretion. I will resolve to "None of them" if she says words to that effect.
May 6, 8:46am: If I read her the answers I will read them highest-percentage first. If I show them to her, I don't know what order she'll read them in.
Knock knock? (Who’s there?)
Boo. (Boo who?)
Why are you crying it’s just a joke!
Chosen
8%

Gurkenglas answered
Knock knock? (Who's there?)
Interrupting cow! (Interruptin-)
Mooooo!
25%
Yev answered
Knock knock. (Who's there?)
Europe. (Europe who?)
No, YOU'RE a poo!
21%

Manifold Markets answered
A: Knock knock.
B: Who’s there?
A: To.
B: To who?
A: No, “to whom.”
17%
Yev answered
Knock knock. (Who's there?)
Cargo. (Cargo who?)
No, car go "beep beep"!
12%

Adam answered
Knock Knock! (Who's There?)
Orange! (Orange Who?)
Orange you glad I didn't say Banana?
3%

wasabipesto answered
Knock knock? (Who's there?)
Little old lady! (Little old lady who?)
Hey, I didn't know you could yodel!
3%
Yev answered
Knock knock. (Who's there?)
Hawaii. (Hawaii who?)
I'm fine, Hawaii you?
3%
Martin Randall answered
None of them
2%

Gurkenglas answered24 days ago
Knock knock? (Who's there?)
Interrupting cow! (Interruptin-)
Mooooo!
25%

Manifold Markets bought M$2021 days ago
Banger
Martin Randall is betting None of them 16 days ago
"medium funny"
Yev answered23 days ago
Knock knock. (Who's there?)
Europe. (Europe who?)
No, YOU'RE a poo!
21%
Martin Randall is betting None of them 16 days ago
"Winnie the Pooh?"

Manifold Markets answered21 days ago
A: Knock knock.
B: Who’s there?
A: To.
B: To who?
A: No, “to whom.”
17%

I don't think a 7-year-old would get this joke
Martin Randall is betting None of them 16 days ago
No, she didn't get it, sorry!
Yev answered23 days ago
Knock knock. (Who's there?)
Cargo. (Cargo who?)
No, car go "beep beep"!
12%
Martin Randall is betting None of them 16 days ago
Second place!
Charlie answered21 days ago
Knock knock? (Who’s there?)
Boo. (Boo who?)
Why are you crying it’s just a joke!
8%

Adam answered24 days ago
Knock Knock! (Who's There?)
Orange! (Orange Who?)
Orange you glad I didn't say Banana?
3%

wasabipesto answered24 days ago
Knock knock? (Who's there?)
Little old lady! (Little old lady who?)
Hey, I didn't know you could yodel!
3%
Yev answered23 days ago
Knock knock. (Who's there?)
Hawaii. (Hawaii who?)
I'm fine, Hawaii you?
3%
Martin Randall answered24 days ago
None of them
2%
General Comments
I think the market outcome depends heavily on whether you tell them or offer them to be read. Some of them would benefit strongly from being told, rather than read.
If I read her the answers I will read them highest-percentage first. If I show them to her, I don't know what order she'll read them in.
Good point. I wonder what the fairest order would be.
I think the order you read the jokes in may have a significant impact on her response. (Hence, why most standup comedians have openers).