Don't get the big deal about weed, I do it with my mate about 1-2 times a month(tonight being one of them), I felt it but It wasn't my sorta thing, It just seemed like everyone around me was getting stoned, while I took just as much, maybe more and It really had no effect on me. It might of, but I can't say I really enjoyed what I was feeling.. I always get booming headaches after it as well. Always.
Ketamine was fun, just felt like I was melting into the world, and became very prone to laughing. Don't think I'll be doing it again anytime soon though. I'm down for trying stuff now and then like ketamine, LSD etc.. but In little amounts so I know what my tolerances are like to start with.. Thats what I did with the ket.. I try to be responsible