Got one about my boss.
One day he came to the office at about 8pm when all staff has gone. He checked the computers to see if they're still on, jogged down the owner's name, and shut them down. The next day he stormed into my supervisor's--the IT manager's room and blame her for not straightening the rule of shutting down computer when the staff leaves, and wanted to fine those people he jogged down the night before.
I was in my supervisor's room when he stormed in, and I realized that it was him who interrupted my scheduled everyday task to update the company's interal database, by shutting my computer down. I quickly informed him that I have to let my machine on, warned him not to do that again, and threaten that the company's data might corrupt if he does so.
He then blamed me for not telling him in advance, and this and that, for about half an hour, and left the room.
Luckily he didn't bring up the topic again.