None. They can't climb the ladder.
One.
I don't waste my time with these childish jokes.
A ladder.
Two. One to hold the ladder and one to screw your mother - I mean light bulb!
Lets go play on our bikes.
One, but he wishes it was two.
Because he needed a crap.
He needed to see if how fast his grade dropped broke any laws of physics.
Ivy.
To see what was on the other side.