At a party, the fourteen years old girls, not related to the fifty year old man, asked him to tell them Tom Swifties. He did what he could. "My car broke down and this is the only way I have to get to town," explained Tom hoarsely. And an old one of mine: "I love camping, " said Tom intensely. They appreciated and admired the man.

You always fear what will happen when you run out of jokes, though.

Illustration of the principle from Buster Keaton's "The Cameraman" -- throughout the movie when Keaton left the newsreel office, he managed to break the window in the office door. But when he is banished from the office and the presence of the girl, the window doesn't break. It isn't so much that the joke wouldn't fit the mood, it is that the absence of the joke to be expected given the pattern creates the sadness, it is the sadness.

So you don't want to run out of jokes for 14 year old girls.