The way I test the rationality of the people around me is by lying to them, generally about irrelevant things, and seeing if they can unravel the lies.

I don't believe you.

I have friends like this, who don't know how to open their mouths or set hands to keyboard without trolling. (I mean, I can't open my mouth without trolling, but I try to be slightly aware of and useful with it.) They tend to exercise it a lot on my LiveJournal. I blocked one from a non-LJ blog of mine for doing the same sort of thing there, where it was just the wrong place. But on LJ - or my own, at least - it's somewhat tolerable because it's the right sort of social space, sort of. YMMV.