Oh sorry, that was me.
On a more serious note, I know exactly what you're talking about. I was at a friend's house for a sleepover one time and we were bored out of our loving minds because the power went out (storming like all hell outside) and we couldn't play any video games or anything like that, so we decided to play a board game. When his parents got home with take-out (because they couldn't cook anything due to power outage), we went into the kitchen to have dinner. After dinner, we went back upstairs to his room to finish our board game. When we got back up there, all the board game pieces were scattered all over his room and the board was upside down. He has no pets, nor siblings, and the only people in the house were all sitting at the dinner table downstairs.
I don't really remember what we did after that but I think the power came on not too much later, so we kind of just dismissed it as something like, "Maybe one of us knocked it on the floor when we stood up to go downstairs." That was about a year ago, neither of us have forgotten it, although we kinda joke about it now whenever it comes up in conversation.