I'm not sure if this is embarrassing to anyone else, but it still makes me sweat at 3am in the morning...
First few days at Uni, trying to be cool and confident with new group of friends.
Had a cold, so blew my nose before I went into lunch in the dinner hall (we were in halls of residence).
Someone knocked on the door, so quickly dropped tissue in the bin and went to lunch - queued up with everyone, asked for egg and chips, chatted pleasantly for a few minutes, uuntil one of my "new" friends, said hesitantly
"umm, you've got an ummm...thingey on your eyebrow?"
Cue me saying casually "what? oh it'll just be mascara"
"No, it's a big... thingey "
Put my hand up and felt this sticky stuff. Yep, a huge green lump of snot had stuck itself just above my eyebrow. It was enormous and all crusty and green, and .I honestly hadn't felt it attach itself when I blew my nose.
Rushed to the toilet, bright red and removed it...still get teased about it today...