I was completely destroyed the first time I rolled the bones. It wasn't D&D*, it was Cyberpunk. I had witnessed a short session one evening and decided that I wanted in on that. So, the GM spent some time helping me create a character and then ran me through a quick scenario. I think it lasted only a couple of rounds. Protip: Don't attack a group of people if you are the only player character.
* My first evil step mother was against the Dungeons and Dragons thing. She was convinced that it was the gateway to Hell. I was just reading a book that a friend had loaned me and SHE TORE IT UP. She did write my friend a cheque to reimburse him for the loss, but damn, right?