Last time I did shrooms I became convinced that I was the only person in the world, then spent several hours on my bed impersonating a steam engine (not a train or anything, just the actual engine)...
Oddly enough I didn't find much time for computer games.
Exactly what I was going to say!
I've never been able to enjoy a video game or computer game while I was on hallucinogenics. They always seemed to force me back to the reality of where I was and what I was doing, which was the opposite of what I took the drugs for.