You mentioned that this person was a classmate of yours. Did you know him personally? Is there an article or some kind or obituary that you can link to?

I hate to play devil's advocate, but this story has been told time and time again in different settings. sometimes it's a girl, sometimes its a college student, etc. but it always ends up with the person jumping out of a window/rooftop because they've convinced themselves that they can fly. I'm not saying that this particular story isn't true, but it's become the classic anti-LSD urban myth.