[Suislide]

Originally Posted by ci5ic

My absolute favorite:

me: knock knock...
them: who's there?
me: interrupting cow.
them: interrup..
me: MOOOOOOOOO!

Now, it's also fun, right after doing the previous one, to next do:

me: knock knock...
them: who's there?
me: interrupting chicken.
them: interrup..
me: BAGACK!!!!!

(and of course, when you get to the part where you say "interrupting chicken", they'll give you a look like "I'm not dumb enough to fall for the same joke twice", but you say "c'mon", and eventually they'll play along.

first one is hilarious.