A guy walks into a bar and seats himself next to an attractive woman. They get talking and after a while are hitting it off.

The woman notices that the guy is looking at his watch. She teases him: "Is your date running late?"

The guy says: " No, I'm not expecting anybody. It's just that I just bought this new telepathic watch and I was checking the time".

The woman is intrigued and asks:" "Telepathic watch? What's that?".

The guy explains:" It's a watch that tells me what's happening an hour ahead. For example, it tells me you're not wearing panties".

The woman giggles and says: " But I am wearing panties!".

The guy taps the watch in frustration and says: " Damn! It's an hour fast!".