Reading someone's mind with scary accuracy. Even more true if the thing that was mind read was so far out of left field that it feels like Professor X was sitting by in his wheel chair probing your inmost thoughts. Likely, the charlesing will be reoccuring and become an irritation. It's a creepy bonding experience.
(Guy 1 thinks of ordering a pineapple and pepperoni pizza)
Guy 2: Man, I'm crazy hungry. Let's order some weird-ass pineapple pepperoni pizza or something.