Ghost possession? You won't see any ghosts around here unless you go looking for them, so I think you're pretty safe from that. Demons, on the other hand...well, they did explain the stuff about rock salt and holy water and the symbols, didn't they?
And demonic possession isn't a game. I don't know how the ghost possession was, but speaking as someone who has experienced and seen what a demon can do to a person, I do think you shouldn't talk too lightly about it.
Then I guess I'll have to get some from the store tonight or something. It's good fuel for everyone there. Do you want me to drop you off and pick you back up or should I let you run in, get your drink, and then bring you back?