Oh, another thing that ticks me off... trying to teach "friends".
I play this 2NL home game for fun, where people try to learn a bit. The money is not an issue for them, but we decided to play for at least something to keep it interesting, we are all friends in there. At first, I was teaching them quite a bit... but then I gave up and let another guy do all the teaching because of things like this:
We spend 30-40 minutes talking about the downsides of slowplaying. Explain all the reasoning behind it. Give examples. Etc. Then this happens.
I am BTN with J
Villain is MP and raises to 4BB.
MP checks, Hero bets 4BB, MP calls.
MP checks, Hero bets 16BB, MP Goes All-in, Hero calls.
Hero wins with nut straight.
MP mucks KQo
Me: Why did you slowplay after we spent like 40 minutes talking about the pitfalls of slowplaying?
MP: Well, I have a very strong hand and the chances of him having a good drawing hand are so bad, and besides he might just get a lower 2 pair and I will stack him... I will win in the long run.
Me: ... .... ... ... ok, sounds like your logic is splendid! You are learning really fast!