First a disclaimer: even after all the following, I am still undecided as to the existence of ghosts. On one hand, I am a pretty pragmatic person, and like solid evidence of things; on the other hand, this all happened to me personally, NOT some friend-of-a-friend or whoever!
I’ve been a movie theater projectionist for a long, long time now; occasionally in newer theaters (my current one is a five-year-old IMAX — woot!), but many times, especially in my earlier days, I’ve worked the oldest places in the area. For one twelve year stretch I was at a theater built in 1911, which is where I encountered Caspar.