Mouse Slips

I always have laughed at my opps (this happened most often on Yahoo! Games chess) when they've blundered and then blamed it on the mouse slipping. Usually, it's pretty obvious that they simply screwed up. Last night, I played a game on FICS and, down a bishop, managed to queen-fork my opp's king and bishop. This would have equalized the game. So, I click on my queen and...whoops!...yes, you guessed it, instead of landing on the square of my opp's bishop, my queen lands on the square before it. I struggle on for a few more moves and then resign.

But...I can't get this loss out of my head! It shouldn't have happened! It wouldn't have happened in an OTB game, because I'd have physically picked up my queen and physically sat it down on my opp's bishop's square and removed his bishop. Man, does that have me steamed!!!!