I suppose the 4th I guess. I don't ever really need a sitter......in fact I often prefer tripping alone or with a close girlfriend at most since trips end up being more intense. I get a lot of fun from tripping in general so even a "difficult" trip can be described as quite euphoric.
Definitely agree... my most beautiful journeys ever were the ones that I saw some kind world ending, or thought I was dying etc... My ego was a gnat and the drug was a train hitting it.