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Question: What has 4 wheels and flies?

Ans: garbage truck!
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I recently asked a friend, "Has your son decided what he wants to be when he grows up?" 

"Yes, he wants to be a garbage collector," my friend replied. 

I had to think about that one for a moment! "That's a rather strange ambition to have
for a career." I finally managed to reply. 

"Well," said the boy's father, "he thinks that garbage collectors only work on Tuesdays!"
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