12 tricky riddles to exercise your brain

What goes up and down but doesn't move?

What should you do when you see a green man?

What occurs once in a minute, twice in a moment and never in a thousand years?

How can you place a pencil on the floor so that no one can jump over it?

During what month do people sleep the least?

What language do people speak without saying a word out loud?

What can never be placed in a sauce pan?

What disappears if you say its name?

Three doctors said that Robert was their brother. Robert said he had no brothers. Who is lying?

A jar is put on the edge of the table in such a way that half of it is left hanging. What is in the jar?

There are three sticks. Can you make four out of them without breaking any?

What lets you look right through a wall?