Since you're all posting these cool stories, here's mine. I knew a dude who went on a 10 day amphetamine binge, a single 10 day run without sleep. On the last day he ended up walking out of the window while trying to reach for a cloud or something (didn't break anything but passed out). When you don't sleep for more than 5-6 days, you start having hallucinations and symptoms very similar to schizo, so this guy was pretty much living in his own world for half a week. When he woke up in the hospital he couldn't remember anything from the last 4 days or so. Got diagnosed schizo, can't get a new job, pretty much fucked for life.
My worst was a 5 day long run and I was hearing random shit as well at that point. I could hear voices of my friends talking to me when they weren't even around, random echoes etc. I could hear my own voice replying to them if I didn't focus on it for long enough as well. I knew it wasn't real though, but yeah I can see how if I kept going I probably would eventually believe it is real. Never stayed up for longer than 2 days after that, lol.