Firehouse Ghost
When you put a sheet over your head and body with a glory hole cut in the penis area with junk out walk up to the head of a mates bunk making ghostly sounds. Can easily be adapted into a "gay firehouse ghost" by cutting two eyeholes into the sheet.
"Damb I was getting ready to sac out on a tower shift last night and the firehouse ghost got at me real close, had to fight him off with a bic lighter again"...