How smart are you?

1. A man and his son are in a car accident. The father dies on the
scene, but the child is rushed to the hospital. When he arrives the
surgeon says, "I can't operate on this boy, he is my son!" How can this
be?

2. A man is wearing black. Black shoes, socks, trousers, lumper,
gloves & balaclava. He is walking down a black street with all the street lamps off. A black car is coming towards him with its light off but somehow manages to stop in time. How did the driver see the man?

3. Why is it better to have round manhole covers than square ones?
(This is logical rather than lateral, but it is a good puzzle that can be
solved by lateral thinking techniques. It is supposedly used by a very
well known software company as an interview question for prospective
employees)

4. A man went to a party and drank some of the punch. He then left
early. Everyone else at the party who drank the punch subsequently died of poisoning. Why did the man not die?

5. A man walks into a bar and asks the barman for a glass of water.
The barman pulls out a gun and points it at the man. The man says 'Thank you' and walks out. (This puzzle claims to be the best of the genre. It is simple in its statement, absolutely baffling and yet with a completely satisfying solution. Most people struggle very hard to solve this one yet they like the answer when they hear it or have the satisfaction of figuring it out.)



Answers
1. The surgeon was his mother.


2. It was daytime.


3. A square manhole cover can be turned and dropped down the diagonalof the manhole. A round manhole cannot be dropped down the manhole. So for safety and practicality, all manhole covers should be round.

4. The poison in the punch came from the ice cubes. When the man drank the punch, the ice was fully frozen. Gradually it melted, poisoning the punch.

5. The man had hiccups. The barman recognized this from his speech and drew the gun in order to give him a shock. It worked and cured the
hiccups so the man no longer needed the water.