I took this from another board.
Here is how it goes:
You have to act as if you haven't heard the previous poster well, and post something that sounds similar but makes no sense.
I've got a cucumber.
What? You want what number?
YOU GOT FIRED? I'M SORRY TO HEAR THAT.
WHAT? I'm not fat!
Low-fat? Are you on a diet?
No, I don't want to buy that.
Pat? Where? Have you seen her?
Yes, Cher is a senior.
No, no I'm not a singer
Yes, Klinger was my favorite character on MASH
No you cannot run your finger through my mustache!
Why do you want to use a wringer on a muskrat?