Milkman

One morning a milkman called on one of his regular customers and was surprised to see a white bed sheet with a hole in the middle hanging up in her living room.

The housewife explained that she'd had a party the night before in which the company played "Who's Whose" - each of the men had put their equipment through the hole and the women tried to guess their identity.

"Gee, that sounds like fun," said the milkman. "Sure wish I'd been there."

"You should have been," said the housewife. "Your name came up three times."