I had a friend that I play shooters with now and then that did a round through a place once for severe depression. My favorite story he told was about a group therapy session. They were talking about things they enjoyed doing, and he brought up DnD. The shrink took a KEEN interest. Keen as in
"So you say when you play... you are a wizard that casts spells."
"...It's a game. Fantasy. Make believe."
"Have you ever tried casting these spells on someone else?"
"Jesus, NO! The wizard doesn't exist! It's made up! I don't think I'm a wizard! I only pretend to be one in a land that someone else made up! You have no idea what Dungeons and Dragons is, do you?"
It apparently went on for a period of time, and the next shrink that talked to him about the delusional fits the group therapy one wrote down about, he broke into laughter after hearing it was Dungeons and Dragons.