This was from a recent tournament I played in. I don't remember where all the pieces were, so I just filled in the relevent details. It was the last round of the tournament, and I was matched with a weaker player. All I had to do was win/draw to finish in the money. We started out with a Sicilian. It was a long day and I was tired, and probably a little too overconfidant/careless. I had just played Qc7 to finish my development, which is a very standard move. But after like 15 seconds after I played it, my mind was racing like, "Oh crap, I had a good position as Black, but I just hung my Rook/Queen!! If he sees it, there's no way I can win :(((". But I just sat there, and treated it as if I played any of the others moves I played, still as a mouse not breathing, hoping he wouldn't catch my mistake. After like a minute (a really really long minute) he played something like Rac8. And I was like, "Whewwww!!!!". I got my lady to safety and went on to cruise to a win. After the game, I showed him my mistake, and he admitted that he was nervous about my Queen on the semi-open c-file (we were playing the Sicilian afterall), and he wanted to lock up control of that file with his Rook and missed the tactical shot to win him the game.
To this day we still keep in touch and play online.
a saint wow you flatter me.