A coworker I didn’t particularly like, but we were able to work together fine, was leaving the job. On his last day…I came in to start my shift, he was ending his…we were the only two on staff (evening/nights job). I kept a box of ice cream sandwiches with my name on it in the work fridge for a mid-shift snack. Found out later in my shift that he ate the last one…put the wrapper in the box and left the box in the freezer. Not sure if it was personal or he was just a POS…but I was LIVID.
Definitely more of a “mildly infuriating” one…but it sticks with me.