I had two friends that worked across the street from one another, and one of them could see through the windows at night to the guy across the street who could NOT see through the windows (the interior lights were too bright).
The one who COULD see would change his voice and call the guy who couldn't and say, "I see you. I see you in your green shirt hunched over your drawing board..."
The guy who couldn't see would freak out, hang up, call security and panic...because he is an editorial cartoonist and would get hate mail and death threats constantly. But, it was all in good fun and they laugh about it now.