Effects - Psychosis from Magic Mushrooms?

[Corksil]

"mental disorder, with or without organic damage, characterized by derangement of personality and loss of contact with reality and causing deterioration of normal social functioning"

This is the definition SWIM got for Psychosis - and it seems quite fitting. SWIM was tripping with a friend recently and SWIM's friend seemed to become a completely different person. Does anyone have any experience with something like this? It was slightly disturbing, because SWIM's friend seemed to talk differently and act differently - like he never had before.

SWIM would say "hey xxxxx" and xxxxx would look at him and say "yessssss... that is what they call me..... xxxxx" and ignore the question. SWIM would ask again, and xxxxx would say "xxxxx isn't here right now... please leave a message." then laugh hysterically. Kinda strange - anyone have anything to add?