My first job was as a trainee pipe organ builder and that often meant occasional church organ rebuilds.
I was working in a church late afternoon in winter years ago and it was dark outside. The vicar had already bollocked me the night before for wasting energy by leaving the lights on at the back off the church when I was working on the organ near the alter at the front. It was pitch black where the congregation sat at the back of the church and where we were storing all the pipes, soundboxes, wooden panels etc. out of the organ and I had a solitary light shining on the organ keyboard.
That afternoon, I was sat resetting the keys on the keyboard and it was deadly quiet inside the church. All of a sudden I heard lots of almighty crashing and banging at the back of the church like some poltergeist had smashed everything around the place. My heart was beating about 200bpm and I sprung up and sprinted for the light switches and threw them all on. I stood there expecting to see half of the back of the church smashed up, but everything looked fine
I made my way slowly towards the back to inspect closer the organ parts and everything looked to be in place.
Still shaken, I made my way back to the keyboard and started replacing the keys again, keeping an eye on the back. After a short while I thought i'd better switch the lights off again or that vicar will be in again to remind me that power isn't cheap. So I switched them all off. My heart rate had calmed to to something resembling normal again and I got stuck into my job again.
CRASH, BANG, THUD, SMASH again, I jumped about 10 foot into the air and legged it out of the church as quick as I could, I was almost too scared to lock it, but just about managed to without soiling my pants.
I thought "I won't be working in there after dark again"