State-of-the Art Watch

A guy walks into a bar and sits down next to the best looking girl in the place and starts looking at his watch.
The girl notices this and asks him if his date is late.
“No”, he replies, “I’ve just got this new state-of-the-art watch and I was just about to test it.”
“What does it do?” she asked.
“It uses alpha waves to telepathically talk to me.”
“What’s it telling you now?”
“Well, it says you’re not wearing any panties.”
“Ha! Well it must be broken then, because I am wearing panties!”
“Damn thing,” the guy says tapping the watch, “must be an hour fast.”