Thanks
I guess you are right about betting the river. It's a problem I have. Flush hits that look obvious often scare me out of the hand
Bluffing like this is quite new to me. I also find this bluff to be really clever, but I think he was lucky that I held QQ and not KK or AA. Sounds strange maybe, but like I said my confidence on QQ is a bit low and made me think I was beat to easily.
As it turned out the guy in fact seems to be a total maniac. He continued to bet 43o all the way to the river paying of a solid rock player, holding a set of A's, with his pair of 4's... Then he left, still with a big stack though. I've looked at his hands in poker tracker and after seeing how he plays I will be looking for him

I guess I should thank him for showing his cards. Still I got a bit upset and really got to test my self control in the hands to come. I'm actually quite proud of playing as usual after this and finally leaving the table with a profit of 30$. I even pulled of a river bluff myself after not hitting a AKs flush draw, so I guess I learned something