This situation did happen to me. We were in the final phase of a tournament, 5 handed. I was UTG. The cards were dealt and small blind, in one of those weird moments, turned his 2 cards face up as he was trying to put them under his card protector. He quickly flipped them back over. It was totally the result of his actions, just one of those "oops" moments. This was in the infamous "Stoner" game and no one else was paying any attention and did not see the exposed cards.
I saw them clearly, they were Q 10 off suit, and he knew I had seen them. I was holding A 9 and made a 3.5 times the BB raise. As I made the raise I immediately felt that I was at a huge advantage so I got everybody's attention and announced that I saw SB's cards and the action that I just took was the result of having that information. I told them they were 10 Q off. In other words what I had could beat 10-Q off, unless I was bluffing, which I never do. Everyone folded around to the SB and amazingly he called. He only had abt 10 BB and figured he had to make a stand sometime. BB folded & it was heads up. Flop came 10-blank-blank. He shrugged his shoulders and pushed. I had to fold. Very strange situation.
We discussed it in Top Pair Episode 84 and again in the episode to be released this Saturday, the 28th.
www.toppair.net