Do you inform someone when they have an eye crust?

Best to try subtle hints like coughing to get their attention then scratching at your eye as if to remove some yourself

Yes, I do. I would hate to walk around all day with some booger or other hanging from anywhere and know that everyone I saw just looked at it and chuckled...and then let me walk over to the next person so they could chuckle at me, too.

I always tell people. (but in a discreet fashion...I would never point it out in front of others...) I am like you and would prefer the same done for me. I tell people when their fly is down, when they have a "crusty" ,whether it be nose or eye, when they have a hair near their mouth and their eating...yes, those I tell consider me a good friend. I don't know why this guy got embarrassed.

absolutely, unless I dislike the person or I want to embarrass a friend.

if we're going clubbin' and one of my boys had a booger hanging out, I tell him immediately so he doesn't mess up our game

I would if it was someone I liked, if I thought the guy was an a$$, I'd just let him go on with his bad self, and the eye boogie!

sure - same goes for snot hanging in the face, fartpants, sperm on trousers. Absolutely.

personaly, i like watching the expressions of people when they see it. but unless if you are really good friends of the person, you shouldn't tell them cuz its fun watching other people.

why would I ruin my fun??? So no, I don't tell them. I just talk about them later.

tell them right away, but as discretely as possible

yes.