I'm working on getting this confirmed, but I got hit on the head super hard as a child--bicycle vs motor vehicle accident. When people are tired, as a rule, they tend to struggle a lot more with cognitive things, right? This gets worse after an injury like that. Well, when I get tired, there's a lot of things that tend to happen more often, that seem to happen "randomly" the rest of the day. Stuttering is one of them. I know I couldn't have stuttered as a kid. I only took notice of stuttering as an adult, and my family is also verbally abusive, and loves to point out traits like that. (They have made fun of my stuttering, my inability to form coherent sentences, and the fact that I will sometimes forget words, or exchange words for words that sound alike or mean almost the same thing. I have yet to be called out on my odd idioms.) Even if my parents wouldn't have, things like my limp have been pointed out by my Grandmother. Little imperfections *get noticed* by my family. It had to have happened when I was an adult, or I would never be allowed to forget it. Note: I call it a "little imperfection" because my stutter ranges from mild to moderate, and sometimes is totally absent. Sometimes I am capable of totally carefree conversation, and I'm aware others here are not.