If missing666 is right about Fweddie's riddle, that is virtually impossible to get right if you don't know it, purely because the answer comes from out of nothing. I thought the answer was walk through the walls, because they're not made of anything.

I have some riddles.

A man lives on the 12th floor of a building. He works every day of the week. Each day, he takes the elevator down to the ground floor and goes to work. Then he comes back, uses the elevator to go to the 6th floor, and then uses the stairs to walk to the 12th floor. Why is this?

And before anyone asks:
- no, the elevator doesn't mysteriously break every day on the 6th floor
- no, the elevator doesn't have any faults and it is perfectly capable of reaching the 12th floor
- no, the man does not walk the steps through choice, or for exercise