Sometimes Google doesn't personalize search results enough for me. I do some academic stuff in $FIELD, and sometimes (can't think of an example off the top of my head, sorry) the keywords for a $FIELD-related search happen to namespace-collide with something completely unrelated that I don't even think of until I try to Google the keywords and get a faceful of crap about vacations to Disneyworld or divorce lawyers or caring for your pet lizard.

Never happens with tech jargon though.