When I was a kid, around 9 or 10, I got real interested in magic shows and my Mom got me books on card and sleight of hand tricks. She also took me to magic stores around town which was always fun. The staff all knew the tricks and were happy to demonstrate, and to really sell the mysterious vibes they were almost all decorated like a modern day Spirit Halloween store with a lot of black and creepy occult accoutrements. None of this really bothered me as I "knew" all that stuff was fake. (This was before my Glimmer Man encounter)
When I was about 13 or 14 or I went to a small magic shop in West Hollywood that had some interesting stuff but also gave me the creeps. There was nothing fundamentally different about this particular shop but it felt heavy and claustrophobic. It also felt "dirty", not physically unclean but like something sexually perverted. At that age the only thing I could compare it to was like accidentally wandering into an adult book store.
I kept having the feeling that the clerk was watching me, which happened in other stores since appearance wise I matched the description of about half the shoplifters in Los Angeles. Except everytime I looked over the clerk was just reading his book. There was nobody else there but I definitely felt like I was being watched. I wanted to see what all they had but part of me wanted to leave and I couldn't explain why. And aside from the uncomfortable feelings nothing actually happened there.
I actually had a few nightmares about that shop in the months afterwards. Dreams where I was stuck in the shop with something inside that wouldn't let me leave. The strangest of these dreams involved me being so scared that I felt the need to pray for help, but couldn't. In my dream I was stuck in this shop and my throat would close up if I tried to say "Jesus". I finally was able to fight through and call out "Help me Jesus" and thats when I was able to leave in my dream. I never dreamt of that place again.