Alright, as much as you want to yell at the fish or donk who put a bad beat (or several) on you, don't even talk to him, not a word. Even if he can't stop talking. I've seen many times where players get mad and start telling the donk what they put him on or that they know when he's bluffing - they actually tell the fish what his tells are. Why would you do such a thing?? Then they proceed to tear the fish/donk a new one every time they win a small pot back from him. What's the point of this? After those few small pots he just leaves, still with a big profit. Just keep your mouth shut and play. He's much more apt to hang around if you stay quiet. That is all.