I am tired of the endless knock knock jokes my six year old tells. She just doesn't get that it is supposed to be a play on words, and instead makes up stuff that makes no sense , and usually ends up in toilet humor.
So I told her this:

Me: knock knock
Bee: Who's there?
Me: smell mop
Bee: smell mop who? (go ahead and say it out loud..)
Me: eeewwwwww!

And then my husband says: When did you become a six year old?

Bwaaahhhhhh!!!! I have to try that one with my six year old;)

LMAO.

I now have a 10, 9, 8 and 7 year old laughing at this (and my husband as well).

My 8 yr old still has a hard time telling knock knocks that make sense (and aren't just random toilet humor!) This one's not toilet humor, but does she know...

knock knock
who's there
interrupting cow
interrupting cow wh-
Mooooo!

That one was a big hit in this house for a while.

My niece loved that one for a while, she's 13 now and she still does it once in a while.

My 8 yr old still has a hard time telling knock knocks that make sense (and aren't just random toilet humor!)

My husband was going nuts with type of joke from our 6 year old, and finally went out and got him a joke book. Rowe'd Runner actually spent (hmm, actaully still spends) a good amount of reading through the jokes. So while we still get bad make you graon jokes, they at least make some sense finally!

My favorites right now are the ones that he tells all he way through the punch line, then says, Mommy, what does that mean??

Here's one I can remember -

How do you keep a skunk from smelling? Hold its nose. (Yeah, like that's even possible.)

I just told my sick 8 year old all these jokes and he's got a look on his face like "really?"

My 3-year old loves telling that one. But she's always a little late with the "Moooo!" That just makes the rest of us laugh even more, though.

Knock knock
Who's there?
Interrupting Pterodactyl
Interrupting Pterodactyl wh-
SCREEEEEEEEEEEEEEEEEEECH!!!!!
(Sadly, I didn't make this up.)
KM&CC

Interrupting Pterodactyl

My kids tell this one all the time, except it's an interrupting cow.
MOOOOOOO