Because it might crack up!
or
Because he wasn't peeling well!
or
Two. One to take out the bulb and drop it, and the other to try and sell it before it crashes (knowing that it's already burned out).
or
What's up, dock?
or
Because an undocumented worker has been living on his head for the past 2 decades!
or
From 2nd to 3rd because there's a shortstop in the middle.
or