The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

What goes through cities and fields, but never moves?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

I look at you, you look at me I raise my right, you raise your left. What am I?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

There is something which you can be arrested for attempting but not for successfully completing.

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?