Not miss-clicks but I have a couple of times tried to be too clever for my own good when attempting to end games.
Game 1
I had a slight lead and there was 1 province remaining. Unfortunately I only had 6 to spend. I then had the bright idea that I could buy Farmland, trash the province in my hand and gain the last province that way
. My opponent bought that last province on his next turn and won.
Game 2.
I spotted a way I could cause a three pile ending to end the game. I started thinking how many provinces, duchies and estates I had bought and how many my opponent had bought. I calculated if I ended the game I would win by 1 point. I lost. My calculations regarding how many provinces, duchies and estates my opponent and myself had in their deck were correct. What I had not considered was that Knights were on the table and my opponent had Dame Josephine in his deck.