A guy meets a girl at the bar and buys her a drink. During the time they were talking, guy keeps looking at this watch. She ask why you are looking at your watch?

He says, It's a new dating watch i just got it for $5000. It will give me information about you like what are you thinking, wearing, eating and all.

She further asks what does it say now? 

He answer, It says that you don't have your underwear on. 

She freaked out and says it's wrong because i do have my underwear. 

He says, It's an hour fast ;-)