Climb up a tree and act like a nut
or
To prevent clients from being billed twice for essentially the same service.
or
2 years old.
Cow: "Mooooove over"
Sheep: "Naaaaaaa."
or
Punch.
or
One; she designs the bulb to crawl up the wall, unscrew the old one, and screw itself in.
or
It doesn't matter, they don't have any electricity any more.
or