This man's in the line at the supermarket check out. But when he gets to the register he realizes he's forgotten to pick up his condoms. So he asks the checkout girl if she could have someone bring them. She replies, "Of course, Sir, but I'll just check your size. Drop your pants please." Wow, he thinks, this is great service, and he drops 'em. She reaches over the counter, grabs his cock, picks the store intercom and announces, "One box of large condoms to check out 10."
Well, the next man in line thought this was interesting and, so, when he gets to the check out, he tells the checker that he too has forgotten to get condoms, and asks if she could have some brought up to the register. Sure enough, she asks him to drop his pants to check his size, gives him a quick feel, picks up the store intercom and says, "One box of medium sized condoms to check out 10."

A few customers back was this teen-age boy. He thought what he'd seen was just so cool, and he'd never had any sexual experience with a woman, so this seemed like his big chance. When he gets to the register, he tells the checker he needs some condoms bringing up. She asks him what size, and he says he doesn't know. So she asks him to drop his pants for her to check. One quick feel, and she picks up the intercom and announces, "Clean up crew to check out 10!"

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There's someone in my head, but it's not not me - Pink Floyd