One. No, two! No, four! No, eight! No, sixteen! No, thirty-two! ...
A fish!
Twenty-one.
They can't, it'd be much too cramped. How would they even get in there in the first place?
Hippies don't screw in light bulbs, they screw in tents.
Two thirty.
Just one but he wants to do it thirty-two times and when he's done everyone says that his last light bulb was much better.