Just thought of another one...

Orange you glad I didn't say banana?

And then when they ask you why, you break into the knock knock joke that goes something like this (prolly doesn't need explaining but hey, I'll explain anyways)...

Knock knock.
Who's there?
Banana.
Banana who?
...and then you start again at...
Knock knock...

go on until you you see fit and then end with...

knock knock.
Who's there?
Orange.
Orange who?
Orange you glad I didn't say banana?

hahahahahahahahahahahahahahahahahah!

Well, my kids thought it was funny!!