I could swear that I saw a link to this somewhere on TVTropes.org, but I can't seem to find it. There was a website detailing a sort of a bolt-on RPG added to a regular game session. All of the players make "character sheets" with their name under "Patient Name" and then a section for their character name, then something indicating patient psychoses. After each gaming session, the GM sits everyone down and informs them that their prior session was a delusional episode which they need to discuss for the purposes of therapy. There was a standard set of questions meant to draw out from the players how their in-character actions — small-scale genocide of kobold populations, looting of tombs, wholesale destruction of habitat, etc — were extremely anti-social behaviors when compared to how we operate IRL.
It was incredibly heavy-handed, Anvilicious to use TV Tropes terminology, but I thought it was an interesting concept and I wanted to pass it on to someone I know.