Cold Steel:
My friend Max is extremely credible in my book. He’s level headed, honest and is a man of integrity. If he told me something in earnest, I’d stake my life on it. Max doesn’t tell his story to just anyone, based in large part their reactions. But he has told his close friends and now seems to be more comfortable in not discussing it, period.
I'm sure Max derives a great deal of enjoyment from laughing at people who believe his story.
I especially like how there's an (entirely anonymous and unverifiable) 'roommate' who 'witnessed' the 'spirit'.
Though it's possible that Max used to enjoy the odd party drug in his school days that could also explain things.