There was a manager from another department who used to come by like clockwork at 10:00am, eating his daily banana, make small-talk for a minute or less as pretext until he finished his fruit, and then deposit the peel in the wastebin under my desk.
Every day.
He liked 'em ripe, too – so unless I fished it out and put it in a wastebin that was farther away, I’d sit there smelling that manky decomposing banana-peel smell (which of course got stronger and stronger) until 5:00. (The bin is for wastepaper, and if it weren’t for Herr Steinfort’s banana peels, it would only need to be emptied about once a week.)
I know this sounds like a petty thing, but it became a real battle over the course of a couple of months. It was so obvious that the only reason he walked over to my department was because it had the closest trash can and he didn’t want the peel stinking up his office. For a while, I just kept moving it to a can away from where everyone worked, and shrugging it off as a weird quirk.
Then I stepped it up to giving him as much stinkeye as I felt I could get away with, what with him being management with 20+ years of seniority. (Which wasn’t much, probably.)
Still, the stinky banana peels kept coming at the same time every day.
Eventually, I started waiting until he was at lunch and putting the peel in the wastebin under his desk. That lasted about a week, and then he stopped bringing them over. I imagine he started stopping by for 10:00 small-talk in the department on the other side of his office.
At no point was a word ever uttered about it, but it was a quiet source of contention for a couple of months.
The Office always reminds me of this kind of utterly trivial (yet strangely consuming) personal drama that unfolds in veal-fattening pens everywhere. 
Then there was the time I was working in the shipping department, and a sales manager asked for a roll of pallet wrap to play a birthday prank on his top salesman. The joke was that he was going to wrap up his car in the parking lot. I refused to give him the pallet wrap, because a) that comes out of our department’s budget and I’d already been getting grief for going through too much of it, and b) you don’t mess with a guy’s ride.
The guy waited until I was working with a customer and reached over the counter and took a roll, running away laughing. :rolleyes:
Did I mention that the salesman’s birthday was in July?
The moron manager wrapped his car up as tight as possible, using an entire roll of pallet wrap. Haw! haw! haw! The afternoon sun did its work, and by the time the salesman discovered the hilarious gag, the plastic wrap had bonded completely with the pristine paint on his late model, image-conscious top-salesman style luxury vehicle. Huge patches of paint came off the top and south-facing side of the car.
Of course, the company paid to have it repainted. Of course. :smack: