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"I'm a fireman", his old friend replies.
"Yeah? My 15-year-old kid wants to be a fireman," says the guy.
"Well," says his friend, "if you want some good advice, you've got to install a pole in your house that will go to the basement so your kid can practice, because the hardest thing for a fireman is to jump off into space and catch that pole in the middle of the night".
Ten years later, the two guys happen to meet again.
"Well, did your son become a fireman"?
"No," moans the guy, "but my daughter is a stripper".