I would go exactly four feet for one. Provided I didn't have to do anything after that.
But seriously- I don't know. I live way out in the middle of nowhere, where the populations is about 1 old lady to 400 cats, and nobody else. So all but one of the friends I make are on the few short trips when I get outta the house, and I don't manage to keep in touch afterwards. Most of these friends- I wouldn't screw with their minds, and that's about it. Of course, I might do all these other things you mentioned, since I don't have any personal opposition to any of them, but only if I knew I wasn't just getting screwed by some guy I knew, even unintentionally, and had some kinda personal compulsion to do so as well- bump off some real ******* we both knew and who was, say, extorting money from my friend, somethiung like that. The only thing I wouldn't do for friend or girlfriend is give up doing what I do best- the Revolution.