Someone shat on our doorstep once. I was heading out to work, saw a man with his trousers round his ankles at the front entrace to our block of flats. He was partially obscured by the door, but I could see he was doing a wee. I thought it odd that he wasn't facing the door to do that (men normally pee against things, don't they?)
Anyway, I didn't want to walk outside while that was going on, so I had a look from the windows in the stairwell and could see he had some friends who were involved in some kind of drug-based activity in our bin area.
As I left the house about 10 minutes later with DH, it became clear why he was peeing at an odd angle - it was because he was also having a GIANT dump right outside the door.
It was the most disgusting thing I've ever seen. Him and his friends were happily smoking crack in our bin area and we were too wussy to confront them. I was FURIOUS though. DH kept trying to lift the situation, saying, 'now, I know we've had a shitty start to the day, but we shouldn't let it ruin everything.'
Got home from work that night and it was gone. I still, to this day, don't know who cleaned it up!