The snot in the nose and spinach in the teeth syndrome is bad but what gets me is when you're talking to someone and they've got a little bit of white spittle on their lips. It's like a little ball that can change position from the top lip to the bottom lip or it can be stored in the corner of the lips.
This little white sphere of cured spittle drives me crazy and there's no good way of telling the offending party other than handing him/her a napkin.
Ok, rant off.