Late Nights and Pranks...

I'm the guy who gets into trouble when everyone else is sleeping. You know how they say you can't catch a criminal because they're always one step ahead? Well, I've been making deliveries to sleepy coworkers for over a year now. It's not really mean or harmful, just little pranks like leaving funny notes on their desks with nonsensical riddles that wake them up... and maybe throw off their workday a bit. But last night, it got out of hand when I left some silly alarm clocks under everyone's chairs before they arrived at work tomorrow morning... It felt good to add just one more giggle into the endless humdrum of our boring warehouse nights, but I'm not sure how long this will be a source of amusement rather than annoyance. Am I being too cheeky? Should I let it go or keep playing this little game?...