So, a little bit of context: I'm not the best player at our club, but I am one of the people who know the rules well, and quite often I'm the one others come to with rules questions. Which makes this all the more embarrassing.
On Thursday night I was playing a couple of games after work. It'd been a long day and I was pretty tired, just relaxing and winding down. I was playing a new guy who I hadn't played before. We were chatting away, placing dials when I (completely absentmindedly) picked up the template for the move I was planning and held it over the table, as though I was measuring the move. After a second or so I had a "WTF am I doing?" moment and put it down again. I have no idea if he even noticed (he was looking at his own dials) but I felt terrible. I probably should have just said "hey, I did that accidentally, my bad" but in the moment I just cringed and hoped he hadn't noticed. At the end of the turn I told him that he was probably going to win (although at that stage it was only slightly in his favour) and offered to concede, or we could play to the bitter end. He opted for the latter and I played the game out, but I was feeling so bad that my heart really wasn't in it (he won pretty easily from there).
Now I don't think I handled it very well, and I'm thinking about apologising next time I see him (though if he actually didn't notice, it may be an odd conversation). I do know how I should have handled it, but the combination of tiredness and extreme embarrassment didn't make for good decision making.
Has anyone else had a similar situation, and what did you do?