I haven't, ever. Yet, I torture myself agreeing to listen to them in hopes that maybe, one day, it will actually be clever/funny/ironic. The whole scenario isn't funny either. What, someone comes to your door, knocks, you ask who it is, and they proceed to waste your time and fuck with you? That's not funny, it's juvenile and aggravating. Whoever came up with this knock-knock joke shenanigan that's taken over as the most popular, yet least funny, joke telling medium, is a menace to the concept of humor in general.
Alright, I'm done.
See, not funny. Not even remotely. I'm not even going to let you finish as there's no way you can turn "I eat mop" into something comical.
THAT IS HELLA FUNNY. i dont even know what is wrong with you
if you cant imagine yourself eating your poo and not laugh there is no hope
hahah mop who.. ma-poo
That's the only funny one i've ever heard and i don't even know if that's how it was intended
it's like... "i eat ma-poo" yeah?
If someone held a gun to your head, and forced you to eat your own crap, would you laugh, or cry? Choose one. If it's laugh, then maybe you do think that particular knock-knock joke is funny.
Edit: Yes, Aestival. Unless I interpreted the joke wrong. Which now, I really hope I have, because if not, that's an idiotic premise.
I thought it was funny >.>
I think more or less, knock knock jokes are meant to be corny and a play on words for those of us who are easily entertained.
I also LOVE elephant jokes. But "Why did the chicken cross the road" jokes never amused me.
Its easy to make me giggle. Its hard to impress me though.
Maybe a few drinks would open your senses to said knock knock jokes :p
I kind of laughed at the mop one because I didn't get it until I read down and it was explained lawl.
I don't know any knock knock jokes. :(

wtf where was there a gun in that joke
it's funny that you got them to say that
like owah tagu siam and stuff like that.
stuff like that makes me laugh my ass off so hard.
Smirnoff, either you're deaf, or you're a hermit. In both cases, I'm sorry for you, yet I envy you. Not knowing any knock-knock jokes is a blessing, but it accordingly means you've never really been around people....
Since when was a gun involved...? Anyway, forget it. haha Obviously you are much too sophisticated and mature to even smile at a shit joke.
I didnt get the second one.
What is owah tagu siam? Its not commin' to me! -feels dumb-
Or like when you say "Look under there! -Under where? " giggle"- D'oh!-"
Of course I've been around people. I've been around people all day. I just don't remember any from my child hood... :p
Not many people I know tell knock knock jokes... a little juvenile, don't you think?

Nay, Aestival. I'm neither mature nor sophisticated. I just don't find fecal matter funny. :(
Edit: Ahh, I understand, Smirnoff. None of my friends tell knock-knock jokes anymore either, but I have several younger siblings. :/
lmfao you have to say it out loud pretty fast it took me second too and then i peed myself with laughter
i'm pretty juvenile then, i love knock knock jokes.