What`s red and does no good for your teeth?
A brick.
What`s white, covered with flour, bakes bread, but not a baker?
Well, it is a baker after all.
A guy in a circus is doing some amazing stuff: he is jiggling with a dozen of flaming torches, and does awesome stunts on a tightrope. The crowd simply loves him, giving him a burst of applause. After the last stunt, the guy bows to the audience, and, with a modest smile, he detaches his artifical arm and leg. Dead silence.
A man from the audience shouts: Ah, so that`s the trick!