I'll start: - If I am at their place and I take a dish or piece of silverware out of the drawer/cabinet and it isn't actually clean, like if there's a piece of dried food stuck to it. Fucking disgusting. Do you just half-ass your cleaning? This is like a double strike if their place has a dishwasher. - If they don't understand present perfect tense. I swear nobody does anymore. For example, if they say "I have ran" instead of "I have run." Or "we haven't ate yet" instead of "we haven't eaten yet." Maybe it's a midwest thing, but I swear every fucking person I talk to makes these mistakes. Actually, now that I think about it, these are turn-offs for friends as well as for gfs Go.