i would still haunt the old people.. turn their tv's to BET or MTV. Maybe put on howard stern on the radio (you might think you can on my parade of haunting with more rules but i would still enjoy it)
actually in alot of cases, sightings of ghosts can be seen in blurred images, sudden chills and hot spots and also white noise. I'm not a believer in ghosts but hey, anything in possible in the afterlife.
The only sign my family has of ghosts is *we think* my grandma turning off a street light when we drive by it.. this has happened at different locations (specific lights usually near one of the houses we live in), different times and different vehicles - right when we pass it.
I do hope people pass on to another place instead of staying behind - I really don't want to have to explain my sins to my ancestors