The dentist was called away from the dinner table to...

The dentist was called away from the dinner table to take an urgent phone call. It was Mr. Tuckerman, explaining that young Junior had gotten himself into quite a fix." See, he was kissing his girlfriend, and when my wife and I came back from the movies we found them stuck together." "I'll come right over, Mr. Tuckerman," said the dentist calmly, "and don't worry about a thing. I have to unlock teenagers' braces all the time." Mr. Tuckerman whispered, "Yes, but from an IUD?"