I'm in the same situation... my next-door neighbors are college kids who party hardy almost every weekend.
A couple weeks ago they had a particularly well-attended and rowdy 3-keg party. I was in the kitchen around 1 AM, and I saw this guy answering nature's call onto our front steps. I pulled a spotlight out of the drawer, opened the window and blasted him in the face during the act. He whipped around to see where the light was coming from and dribbled on his shoes, tried to pinch it off, and walked away awkwardly. I kept the light directly on him, so about 15 people in the front yard next door were watching him by then.
The party quieted right down after that.
