An onion
or
Two, one to call the electrician, and one to mix the drinks.
or
Two. One to screw it in, and one to stab the other in the back and take all the credit.
or
Finding a cabinet position for the thing on his head!
or
One. You don't believe me do you? I've got photos! See that big blob? Well, just squint your eyes a bit. . . .
or
Nothing, peanuts don't talk.
or
To get to the baaaaarber shop
or
It left its tracks.
or