I wouldn’t say ‘boo’ to a ghost. That’s rude and, worse, trite — like saying “Aha!” to Steve Coogan. No, if I e.g. met a ghost rattling chains I might ask “What’s shaking?” Top gag. My problem is a short temper with ghosts. The last time jangling disturbed my sleep, I woke the whole block yelling “Hey! That’s enough of your ghost nonsense! Get outta here, you!” I’m not proud, but come on: it’s well out. With Halloween looming and spirits rising, I’d better practice patience if I’m to stay chill.
Helpfully, Valve have resurrected all past TF2 spooky events (this year’s is still to come). A few scraps with the Horseless Headless Horsemann, a little Ghost Fort, and I’ll be cool as a corpse.