For face-to-face RPGs, I played D&D pretty regularly throughout my teens. Towards the end of them, I also experimented with a few of the World of Darkness RPGs by White Wolf... specifically the Mage, Werewolf, and Vampire modules.
In college, I was invited to a D&D game.
Once.
Apparently, I was supposed to take it a little more seriously than I did.
They didn't like when I slowed their progress by attacking the (previously inert) local flora and fauna, getting myself seriously injured in the process. I also made apparently racist comments to the dark elf.