A boy and his date were parked on a back road some
distance from town, doing what boys and girls do on
back roads some distance from town.

Abruptly, the girl stopped the boy dead in his tracks. "I really
should have mentioned this earlier, but I'm actually a hooker
and I charge $20 for sex." The boy reluctantly paid her, and they did their thing.

After the obligatory cigarette, the boy sat in the driver's seat, staring
out the window. "Why aren't we going anywhere?" asked the girl. "Well, I should have mentioned this before, but I'm actually a taxi driver, and the fare back to town is $25."

Sweet revenge!