A guy and his date were parked on a back road some distance from town, doing what guys and girls do on back roads some distance from town.
As things really started getting hot, the girl stopped the guy and said, "I really should have mentioned this earlier, but I'm actually a hooker and I charge $20 for sex."
The guy reluctantly paid her, and they went on with their business.
After they finished, the guy lit up a cigarette, sat back in the driver's seat and stared 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."