1. Shrooms (Just really fucking fun, as long as you don't make a habit of it... once every month or two is alright)
2. Weed
3. DMT
4. Alcohol
5. Laughing Gas (Nitrous Oxide)
6. Salvia
7. Cocaine
8. Ludes

I enjoy the top 5 quite a bit, don't mind salvia... or cocaine (only when weed is laced with it, i hate snorting it), and I absolutely despise Ludes... worse experience E.V.E.R. on a drug.