H + Coke + Benzo
H + Weed + Beer
H + MDMA
Opium (or poppy tea/grinds) + Mescaline (I call it a spaceball) - I did this at a small one day festival and it was really a unique and wonderful experience. I was tripping balls, with closed and open eyed visuals and the accompanying psychedelic revelations and mindset but at the same time I was utterly relaxed and coherent and able to carry on conversations with non-trippers and even enjoy it. Granted, moderate drinking and weed smoking was involved as well. Everything was just smooth and beautiful.
Acid + MDMA