Just wait and they'll tell you.
Canuck-chucks.
The cue tip.
An extrovert mathematician will be looking at the other guy's shoes.
Nothing, because he is the one who knocks.
Because it can't have windows in it!!!!
Because an apple a day keeps the doctor away.
One. They hold it in place and wait for the world to revolve around them.
A car.
Steve Jobs went underground.