Ok well i'll share my experience I guess.
I have a scope on a lawnmower and simply roll it out of the garage.
IT is nearly 9 years old!
I have had it since Mars 2003.
Anyhoo, I have mirror in the garage and white sheets covering things. Now this can sometimes give me the heebyjeebies, and I noticed that one tends to see ghosts and aliens when one is spooked. If one is not spooked, it's like ghosts simply don't exist.
Anyway, one eye in the eyepiece, one eye looking sideways into open door of garage, I see fluttering in mirror.
I freak out like this.
I rush inside and I only come out later with assistance to help me put scope back from my gf.