How about losing a game because of failing to make the first move, when you're White....
I just stared at a board expecting my opponent to move.
OMG this happens to me all the time
@Flourish once I stalemated when I had checkmate in one :(
that is why lichess is better than
chess.com isn't it?
I doubleclicked resign once instead of offering a draw when we both only had one rook left...
Roommate resetting the router because his Netflix wasn't streaming properly, destroying a winning game I had against a trash talking kid....
losing a blitz game to someone premoving the entireeee game
Losing a game with checkmate in 1 because my power went out for a second and it takes 2 minutes for my computer and router to reset. (This actually didn't happen, but I was damn close to it. I was able to reopen the game before the opponent could claim victory, fortunately)
@Vempele 6#
I know right, happens all the time for me! Fortunately only in casual games XD
I once accidentally offered a draw in a won position. Pressed the wrong button in the app...