I had a pretty amusing experience with D&D last weekend. Our DM decided to start a little side campaign we could play when anyone couldn't make it for the regular meeting (since our group is only three people plus the DM if anyone can't make it we pretty much have to cancel). So, since the DM's girlfriend couldn't make it last weekend my the two of us made our characters for the side campaign. I was making a Psychic Warrior, and made some joke about stabbing people and then setting them on fire, so once I get my weapon the DM's like, ok your axe can have flames as long as they don't do any damage. Later he ammended that to let the flames be able to ignite things. Like oil.
Meanwhile, my friend's creating a Sword Sage, and apparently he has some move that will also set enemies on fire when he stabs them. He also has a stance that makes him nearly immune to fire while he's in it. Once we get started, we're fighting some goblins and setting them on fire, then has me set him on fire, and then he runs up to a cluster of hobgoblins and starts busting oil balloons in their faces (damaging himself, but killing the hobgoblins. With FIRE).
So basically (without any real planning) both our characters turned out to be insane, introverted piromaniacs. Who says D&D can't be like real life.