Riddle: There is 10 birds on a branch, a man shot 5 of them. How many were left?
Answer: Zero, because when birds see someone coming or hear something they fly away.
Riddle: I leave every time you say my name. What am I?
Answer: Silence.
Riddle: I'm lighter than a feather, but even the strongest man can only hold me for a short time. What am I?
Answer: Breathe.
Riddle: You can crack me; You can make me; You can tell me; You can play me. What am I?
Answer: A joke.
Riddle: One way I'm loose, one way I'm tight; Out with left, in with right. What am I?
Answer: Screw/Screwdriver.
Riddle: My full powers come when my makers are dead; I await a heavy hat to put on my head. What am I?
Answer: Prince.
Riddle: I grow in the dark and shine in the light; The paler I am, the more I am liked; My maker never gets paid, but never goes on strike. What am I?
Answer: A pearl.
Riddle: A single word which is versatile, it can be a letter, unknown to the problem, a variable, a target, a love, an intercept, and a type of chromosome. What am I?
Answer: X.
Riddle: I went to city OZ on the way I saw four women, with four bags, who had four kittens. Each woman had two children with her. How many people went to the city OZ? (count correctly)
Answer: One because I went to city OZ on the way I saw...
Riddle: What can you catch but not throw?
Answer: A cold!