Biting your fingernails!

Little Jimmy bit his fingernails all the time. His parents tried everything to
get him to stop, but to no avail. Finally, his mother, exasperated, decided to
tell him a little white lie to get him to stop.

“Jimmy,” she said, “You’d better stop biting your fingernails. If you don’t,
then those fingernails will pile up inside your stomach and soon your stomach
will be huge and full of fingernails.” Jimmy, worried about the idea of
fingernails in his stomach, agreed to stop.

The next day, Jimmy and his mom were shopping in a supermarket. They went to
check out, and a pregnant woman was waiting in line in front of them. Jimmy
beamed at the pregnant woman and said, “I know what YOU’VE been doing….”