Since nobody got yesterdays, nobody gets any house points...

The correct answer was that John was the only man. The other people in the room were women...

Now for today's riddle... The solution is a little shorter than yesterdays...
A man lives in the penthouse of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. Upon his return, however, he can only travel halfway up in the lift and has to walk the rest of the way - unless it's raining. What is the explanation for this?

oooh i know this one!!! but I've heard it before, so I'll leave it to someone else to answer