Here, houses and trees and whatnot usually only get toiletpapered on Halloween. Recently in Sharon, there has been a much larger presence of the police in town on Halloween, and it has occured less frequently during the past few years (mostly because of drug incidents which occured on the green in past years - also some incidents involving the usage of Nair instead of shaving cream to "bomb" other kids

).
Usually though, kids decide to TP the green in the center of town, covering the trees in it and also spraying shaving cream on the trunks (I can't imagine that is too good for the trees). They also TP alot in Sharon Valley, where alot of kids live (I think they mostly do it to each other's houses), and occasionally they will TP a teacher's house. When it is a teacher, it's not usually done in the best of spirits - one incident I remember was when a bunch of kids decided to "bomb" my seventh grade teacher's house with TP in the trees, accompanied by obscenities written in chalk and shaving cream in front of his house. Of course, this is the teacher that I mentioned in my post in the Generation Gaps thread - he was the one who was always trying to be "cool" and fraternize with the kids on the same level. The kids would often tease him about his personal life and stuff, and he kind of asked for it.
More recently though, and more in the theme of this thread, I remember walking through the parking lot at the school after a robotics meeting and finding one of the kid's trucks covered in sticky notes. It was a more harmless prank, and was done in good spirits as a unique way of showing some affection.
And then there was that one time that I decided to put a bunch of Army recruition pamphlets on the windshield of my English teacher's car (he is notoriously anti-war and would be the last person to join the army). I considered actually putting the Army bumper sticker on his car, but thought that would be too much, considering that those stickers can be a pain to scrape off. One of my friends wanted to put the sticker on the door to the principal's office instead (it would have been ironic because our new principal is very strict about rules and regulations), but decided against it for the same reasons.