Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

If two's company, and three's a crowd, then whats four and five ?

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?

The more of this there is, the less you see. What is it?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What is red and smells like blue paint?

Make a sentence consisting of three words that have the whole alphabet.

They are three errirs in this question. Can you find them?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?