not too long ago we had an ongoing issue with someone calling the restaurant and hanging up. They wouldn't just hang up the second the phone was answered, they'd wait through the "thank you for calling _____, this is _____, how may i help you?" spiel and THEN hang up. After multiple nights of this the GM went and got a set of new phones with caller ID. And what did we find? Turned out one of the (now former) cooks was going in the walk-in cooler and calling the restaurant number every chance he got and hanging up. I guess that's a better way to work out pent up workplace aggression than shooting up the place or starting a fire.
when i worked 3rd shift at the 24 hour chain i had to field prank calls on a nightly basis. I'd have people calling up to order food they knew we didn't have (pizza, burritos, raisin toast), i'd get numerous Sling Blade imitation calls, i'd have guys calling to ask me what type of underwear i had on. I'd also get a number of variations on the "i just left your restaurant/ya'll gave me food poisoning/i can't get up off the toilet" theme, complete with sound effects. But my all time favorite has to be this one:
years ago when i was still willing to train new people (those days are long dead and gone) i'd always have a hard time getting them to answer the phone. Anytime it'd ring they'd try to look busy or they'd walk away real fast like they had pressing business to attend to. Well on the night i'm thinking about i got the new girl to answer the phone and from a distance i watched her start to put a to-go order into the computer. Things seemed to be going well at first so i started doing something else, and when i finally glanced back her way i saw her looking franticly for something on the computer screen. I hurried over and i whispered "what are you looking for?" Covering the mouthpiece of the phone New Girl cried "He wants to get a muffburger--i've looked everywhere and i can't find it! It's not under sandwiches--where's the muffburger at?"
"you know, i really can't help you with that" i said, and i walked away. Eventually dude on the phone said he wanted to get a side of thighs with his muffburger and a Dr. Pecker to drink, and New Girl finally figured out it was a prank call. So see kids, you really do learn something new everyday!