I make a 7 unit bet and get paid 18 units. I grab it immediately and try to be nonchalant about it and put back up another 7 unit bet. I think that was my mistake - I should have then bet 12 units. Anyway, basically at the end of the hand, before the next hand, the dealer gets this 'I done ****ed up' look on his face and calls over the pit lady. He explains what he thinks happened (which is what actually happened) but sort of hedges about it saying "i think" etc. The pit then asks me if I knew what my bet was and what the pay out was, and since I figured they would just check the cameras anyway, I told the truth. She asked me if I wanted to give the 7.5 uni ts back and I told her in a humorous manner "I don't want to, but I will" which got some chuckles from the pit crew, and I paid them there money. Obv. I fully intended to keep the money and took minor steps to prevent the dealer from noticing (grabbed the money like normal, tried not to look confused or overly gleeful, didn't wink at the dealer etc).