well, I enjoy graffiti, but only if it's done with permission.
Breaking windows and shit is dumb. Ruining paint on people's car and stuff is also retarded. Basically if the vandalism causes permanent damage it is dumb.
Pumpkin smashing, I can see why people would do it but it doesn't appeal to me.
I never toilet papered houses as a kid but I have done a few recently and maybe that's why it is fun to me.
We also made a bathroom in this kid from my school's yard which was fun. Like I said as long as it's in good spirit, and able to be cleaned up I say go for it.