Expression: A chip off the old block

Imagine a big rock. Then imagine that someone comes and knocks off a piece of the rock with a hammer. The little piece of rock is much smaller that the big block, but it has the same composition. So we say that a person is a chip off the old block if they are very similar, especially in skills or behavior, to one of their parents. For example, if your father was an actor, and you're an actor, we might say that you're a chip off the old block. If your father makes a lot of jokes, and you do too, then you're a chip off the old block.