Two. One to assume the ladder and one to change the bulb.
A': None. If the government would just leave it alone, it would screw itself in.
or
Because he was feeling crumby.
or
Climb up a tree and act like a nut
or
The letter H.
or
2 years old.
Cow: "Mooooove over"
Sheep: "Naaaaaaa."
or