Here are a few hard riddles, there are more than one answer for a few of them so just put down what you think:

1) A man builds a house with all walls facing north. A bear walks by. What colour is the bear?

2) 2 boxers are in a boxing match (regular boxing not kickboxing). The fight is schelduled for 12 rounds but ends after 6 rounds after one boxer knocks out the other boxer. Yet no man throws a punch. How is this possible?

3) What comes once in a minute, twice in a moment, but never in a thousand years?

4) What has wheels and flies, but is not an aircraft?

5) What is the best month for a parade?

6) You can keep it only after giving it away to someone else. What is it?

7) 2 fathers and 2 sons went duck hunting. Each shot a duck but they shot only 3 ducks in all. How come?

8) What goes up a chimney down, but wont go down a chimney up?

9) What word looks the same upside down and backwards?

10) What walks on four legs in the morning, two legs in the afternoon, and three legs in the evening?