I haven't done much hallucinogens, pot doesn't make you see things. But I have recently tried Diphenhydramine, which is in Benadryl, and that shit made me hallucinate pretty good..
Ha, who needs drugs to hallucinate? Just don't get any sleep for about 60 hours and you'll be fine. The 12 hour nap after is will be the best you've ever had, as well.