I am in a house that I built using just a saw. I have made a window on each side, and each window faces south. Suddenly a bear walks by.

 

What colour is the bear?

Ah, I remember this one from high school.

 

 

For the windows to all be facing south, you'd have to be at the north pole. Hence, the bear is a polar bear and has black skin and white fur.

 

No fooling you guys

Interestingly, if the windows faced north the puzzle would not work. Well, it could but would take a lot of arranging!

That's an interesting point Joatmon.

I suppose you mean because Polar bears arn't native to the south pole.

That's an interesting point Joatmon.

I suppose you mean because Polar bears arn't native to the south pole.