a joke about riding a bicycle

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A kid is learning how to ride a bicycle. And he can't ride in straight line. Then there appears an old man in front of the road. The kid is very afraid of hitting the old man. To avoid this to happen, he shouted to the old man"don't move" The old man didn't know what happened and stopped besides the road. But unfortunately, the kid didn't succeed and hit the old man. The poor old man got very angry and said to the kid" you are really bad,to aim the target,you even let me stop to let you hit?"