Punch them in the hands.
Didn't have any hands.. (the real punch line) Knock knock.. Who's there Not Timmy..
When you see he has no hands.
A sandy hook.
Punch line in comments)
The eyes, cause they di-late.
Nothing. It just shuts up.
Anything you want!
One talks with their hands and makes goofy noises at random volumes, and the other can't hear.