Many years ago, I worked at a cemetery which was in a rather "seedy" part of town. One evening, this lady who worked at the sleazy roach motel across the street called to warn me about some lowlifes who were bringing a boombox and alcohol into the cemetery, saying they were going to "wake the dead."
I never did see anyone, though.
As for respect for the dead in general, I recall a while back there was a construction project, and they came across what appeared to be an old burial ground. They didn't know it was there. It makes me wonder just how many people might be buried beneath me right now and not even knowing it.