We all have quirks, don't we?
Here are some common ones.
When I was growing up, we had a superstition "walk on a crack, break your mother's back". I still will look out, even today, for cracks in the sidewalk.
I was especially interested in one of the common quirks listed in the article I linked to: aversion to textures. Why? I have a number of these, and they seem to be common in a lot of autistic people, too.
When it was my time to start wearing what we, in the 1960's called "nylon stockings", I could not stand the feel of them on my legs. It felt like I was receiving tiny electric shocks.
Before that, I would not wear clothing with certain textures I considered harsh. I still won't, today, although clothing tags don't bother me as much as they used to.
I suspect that my autistic brother in law, Bil, has certain textural adversions. There are many foods he will not eat, for instance. Some of his favorites won't surprise you: chicken and chocolate. One may surprise you: blue cheese. It's a strong taste, but he likes it. He will not normally eat veggies, but sprinkle crumbled blue cheese on it, and he (sometimes) will.
There is one more thing he does, though, that is just "Bil". In the middle of a conversation that has no funny content, he will sometimes start laughing. It doesn't last long. "What's so funny?" his mother may ask, but in an accepting way. I don't think it is related to anything sensory but I've also read it can sometimes be a reaction to pain.