Because he was feeling crumby.
or
Five. Four to decide which way the bulb ought to turn, and . . .
or
Five. One to screw it in and four to tell him how bitchin' he looked doing it.
or
An impasta
or
They are triplets.
or
One in 3,000,000 has a chance of becoming a human being.
or
It takes them a long time to swallow their pride.
or