Riddles thread

[Swan]

I was looking around GT thinking about wat would be cool to have a thread about and then it hit me. *WHAM*

RIDDLES! We need a good thread about riddles. I don't think that there is any other thread for riddles so I started this.

Basically ask riddles and answer them. Oh, and +rep people who can get the hard ones if you want. I'll get the ball rolling.

A house is built with all 4 sides facing south. A bear walks by. What colour is the bear?

EDIT:Type in different colours to make it interesting. Please.