None. It will happen itself.
A: Someone stole the book.
Instructor: You're in the wrong lane.
None, because they keep on asking why all of the other light bulbs in the house aren't being changed at the same time.
Just one. But he has to check it 100 times one for each watt.
None, they didn't Putin enough effort. Just a play on his last name, nothing more.
It takes 1 to screw it in, and 99 to tweet about it.