You haunt them when you’re alive.
Either way, I'd like to haunt ladies' rest rooms.
Considering the fact that you’d have to hang out in ‘em in order to haunt ‘em, I guess you better be a janitor... else you might end up in jail!?

It would only take a few good experiences in a ladies’ restroom to leave your imprint.
Unless you were having a great time being a janitor then it probably wouldn’t work.