Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

A man walked into a pub and went straight towards the Barman. He asked for a dirty martini from the Barman. The Barman thought something and then pulled out a pistol from his drawer and aimed it directly at the man. Why did he do that?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

If 21x = 79x, what is the value of x?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

2, 3, 5, 9, 17, _ What is the next number in the sequence?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

What has to be broken before you can use it?

Can you spot the hidden girl in the picture below?