More guns.
One Brazillion.
Zero. They don't exist.
Two. One to arrest the room for being black, and the other to arrest the bulb for being broke.
A: Twenty. 1 to hold the bulb 2 to turn the ladder and 17 to be on the guest list.
A: More guns.
You can silence a gun.
Nobody knows - they usually lose count at 800 rounds.