This didn't really scare me, but it really disturbed me at the time. I was probably about 5 years old, and I was channel-surfing or something. I paused on one channel and saw two men talking, and one sat in a dentist's chair. The other was fiddling with the guy's tongue, and then the guy spit gauze out of his mouth. I thought the other guy had cut his tongue off, so I freaked out and changed the channel. That scene kind of hung in the back of my mind for years, something that bothered me but didn't traumatize me for life or anything.
About 10 years later, I was watching "Little Shop of Horrors" (the 80s movie version) for the first time, and then the scene where Bill Murray goes to the dentist came on. I thought it was a very funny scene, but I soon realized that it was the scene I had watched ages ago that really disturbed me.
Boy, what a crazy day today. In the afternoon, my coworker had to run out because her husband had some sort of accident involving a tractor or lawnmower or something, and he had to be flown to the hospital. This was right when we had a pressing deadline on a project (it was supposed to be done a week or so ago, but people in another office kept sending more and more changes), so I had to jump on it, and I was pinballing between 3 computers since I was also supposed to be sitting out front (a lot of people have been out of the office in the last week). Oy. I hope the guy is ok.