There's this one drug called Salvia Divinorum (spelling?) it's legal, and it gives you trips that last 15 minutes, but distort time extremely. People that smoke high doses report having lived the entire lives of other people, day by day for the whole life!

I've wondered if you did that and became lucid, a 15 minute lucid that lasts years! That would be pretty fun. I know people that have done it though, and report it as shitty hallucinogen, but they all smoked very little.