For me it was my Ritalin prescription. In the onset we thought I had adult ADHD.
But I hoarded them through weekends and took too much during workdays. The wheels fell off the bus at this point, and ideas of reference were unmasked. I was 25.
I began to insult people with my eyes. The feeling always was: ‘what’s the worst thing I could conceivably say to this person I’m speaking to’, and then like clockwork I believed I was saying it with eye movement coupled with word choice.
I know finally it wasn’t really happening, but you see, when a person is in this state, sometimes you try to ‘get in front of it’ by adding words, and that sadly occurred a little bit too.
I’m sorry @Wave wish I had more here other than my own personal story with it all.