Oldie but a... goodie? Not exactly...
When I was about 12 and my grandparents were over for a visit, I started feeling a little unwell, so I headed to my room for a little lie-down in hopes that I would feel better. I didn't. So I decided to go out to the living room, just to let my parents know I was ill (no, I'm not sure why either - was probably hoping for sympathy).

Now my grandparents were truly lovely people, and they in no way deserved what happened next. I opened the door to the living room where they were sat around a table with my parents, said "I'm not feeling we-" and proceeded to projectile vomit on them. I will never forget the looks of absolute horror on their poor, startled faces as my chunder made its stunningly accurate trip, like some kind of puke-guided missile, to take up residence on their clothing.

My parents quickly pushed me out of the room and I staggered back to bed, via the bathroom, so I'm not entirely sure what happend in the aftermath. I know that some of the sick ended up going down the grate in the floor, with long-lasting results (it's damned hard to clean out an air vent, it seems). And my grandparents never mentioned it. Told you they were nice people.
(BlackArmadillo Avoided writing that article on, Mon 11 Jan 2010, 2:19, Reply)