Everytime I play on a Medieval setting I behave medieval towards Women, children, non-whites, non-christians and strangers: I kick the shit outta them.
I like to show my fellow players how UGLY things were back in those dark ages.
I specially enjoy destroying the mood on any player who's behaving like in a LOTR setting.
If I happen to be the DM I focus pretty much in all my enviromental descriptions on the smell, the ugly hairy women, the misery, the sickness of it all.
There were no beautiful women, no white healthy teeth, no tall people, nothing... just pure shit and everything tasted and stank like shit.