After you die, a leech stops sucking your blood.
or
French Flies.
or
Two, one to screw it in, and another to repent.
or
The bartender offers him a warm smile and says, "For you, no charge".
or
*poof* … he disappeared without a tres!
or
One. No, two. No... How many do we have on the truck?
or
It needed to be trimmed.
or
Only one, but the bulb has got to really WANT to change.
or
Executive Producers don't screw in a light bulb, they screw in a hot tub.
or
but you accidentally say Mother.
or