From contributor Tennessee Thomas

there's a man driving down the freeway with a Penguin in the passenger seat, he gets pulled over by the police... (very angry) "Umm, Sir, What are you doing with this Penguin???... DO ME A FAVOUR AND TAKE HIM TO THE ZOO! NOW!!!" The Man apologizes and agrees to take him to the zoooooo....
NEXT DAY the Man and Penguin are on the road again, and again the Policeman sees them and pulls them over... "WHAT IS GOING ON HERE??? I TOLD YOU TO TAKE THAT PENGUIN TO THE ZOO!!"
To which the man responds, "YEAH!!! I TOOK HIM TO THE ZOO AND HE LIKED IT SOOOOO MUCH THAT TODAY I'M TAKING HIM TO DISNEYLAND!!!"

Knock Knock

Who's there?

Who

Who who?

Wait a second - but did you just hear an owl in here!

Knock Knock

Who's there?

Boo

Boo Who?

No need to cry you flipping baby, I was only having a joke!

Knock Knock

Who's there?

9/11

9/11 who?

You said that you'd never forget!

Knock Knock

Who's there?

I smell of p

I smell of p who?

I wasn't gonna say anything but now that you mention it maybe you should try showering or something like that!

Knock Knock

Who's there?

John Doe

John Doe who?

I dunno - just any old John Doe I guess!

Knock Knock

Who's there?

Kanga who?

Actually, its kangaroo by the way!