pretty much nothing any more, as i've been exposed to all manner of awful, soul rendingly disturbing web searches for the best part of fifteen years now (in other words, literally half my life), since before google even had a garage to put their code test servers in.
the only thing i'd shy away from is either things involving peas, does, fillies and "A" in a certain combination (at least, with safesearch off), or m.y. l.i.t.t.l.e. p.o.n.y. ... the former because i don't fancy a visit from the party van even if just getting some information on a news story, and the latter because i'm convinced there's some kind of dangerous, hypnotic meme incorportated into the cartoons. Shit's spreading like wildfire. Lolcats and the original Portal have nothing on this. It's infesting every OTHER websearch I do, particularly for images. There's some powerful grade-A mindvirus in there somewhere.