Something amazing to tell you concerning physics and motion

[Jenson71]

Originally Posted by MediaCenterJunkie

Okay, I'm guessing this is an easier one.

I haven't read the answer to it, so I am playing along too.

A man who lives on the tenth floor takes the elevator down to the first floor every morning and goes to work. In the evening, when he comes back; on a rainy day, or if there are other people in the elevator, he goes to his floor directly. Otherwise, he goes to the seventh floor and walks up three flights of stairs to his apartment.
Can you explain why?
(This is one of the more popular and most celebrated of all lateral thinking logic puzzles. It is a true classic. Although there are many possible solutions that fit the conditions, only the canonical answer is truly satisfying.)

Because he is sleeping with a girl on the 7th floor who happens to have broken windows that lets in a lot of rain. He doesn't want anyone to know this so he won't get off on the 7th when people are in the elevator with him. And he doesn't want to get wet.

He doesn't attempt to get back on the elevator after doing the deed, because the stairs are very close to her room, and he would otherwise have to go down a long hallway.