I have called a large all in because I hit call button just as someone went all in. or when i am excited about pocket aces I accidently hit the fold button. just got to slow down and wait.
Oh man yesterday, the absolute worst blunder I ever did happened to me during a $2000 tourney. I had pocket 7's, flop comes up 77K. I was in about 40th place and around 50,000 chips. Dude before bets 10k. I know I can get him to eventually go all. So I use the timer to make him believe I'm really thinking, even though I have 4 of a kind. Then my mouse does some stupid twitch and I accidently hit the fold button. I couldn't believe it!