It's worse when you're not expecting it.
Years ago, I drove a minicab for a bit. One day I had a fare who had the most grotesque whelk on his forehead. Young guy, about 19. He was talking about his girlfriend he was meeting off the train.

Feeling like a good Samaritan, I offered him a tissue, pointing to his forehead and saying something like "you've got something stuck to yer headd, mate" He rubbed it, and the fucking thing sprayed right across the roof of the cab and into my eye. Cue screams and frantic wiping with a Kentucky cleaning wipe.
(all my scars face forward possesses 2.5% of a hyperalloy combat chassis, Tue 23 Dec 2008, 17:45, Reply)