That reminds me of a story I heard back in the '80's
A guy is rushing through an airport, and asks another man for the time.
The man put down his two suitcases, looks at his watch, and says "10:37, what flight are you on?"
"108 to Chicago"
The man pokes his watch a couple times and says "Oh, don't worry, you flight was delayed because..."
(poke, poke)
"There is a thunderstorm expected in Chicago when it would arrive." the man finished.
"Did you get that information from your watch?" the guy asked.
"Oh yes, I have airport, traffic, weather, and news reports from across the country available on it"
"Wow! where did you get it?"
"I built it myself at home"
"Can I buy it from you?"
"Oh no, I couldn't sell it, it's one of a kind!"
"I'm a very wealthy man, I'll give you one million dollars for it, surely you could afford to make another with that much money"
"Well... OK"
The guy writes out a check for the million dollars, and the man uses the watch to confirm from a news article the guy is rich, and hands him the watch, and shows him how to use it.
"Thanks again for selling it, this watch will be the envy of my friends", the guy says as he resumes walking to his flight.
"Hang on", the man says as he picks up his two heavy suitcases, "Don't you want the batteries?"