Ketamine after mdma, I've never pushed it mega far but I once was sat on the floor of a small party and in reality I just closed my eyes but as far as I was aware I fell through the floor into a pitch black weightless void, frozen in a moment of time with my friends last words echoing repeatedly, and after several days I rose back out of the floor and returned to my sitting position, just in time to regain control of the CDJs.