Because the teacher said it was a piece of cake!
or
"Let me see your birth certificate".
or
Only one. But he'll leave a big puddle of spit on the floor underneath him.
or
An envelope.
or
Five: one to handle the bulb and four to contemplate how David Sanborn would've done it.
or
Two, one to call Daddy, and one to get the (pick one:) mineral water/Tab.
or