I allowed a Fool's mate once within the first 5 moves as Black against a regular playing friend (the friend plays both over-the-board and online, but this particular occasion was on Chess.com). Yours can't be the worst.
P.S. My friend played too fast and missed the Fool's mate, and we soon realised what had transpired, though I still eventually lost the game anyway many moves later.
I sat down today to play chess. I was in the mood and looking forward to a good game. I then played as if I was blind. I wasn't paying attention all. It was amazing. This was the worst game I've played in a long time. Can't explain it. Just dumb, in every way. Does this ever happen to you? I may log out and go jump off my roof. Good day!