Lex, I do that wallet organizing too! We were discussing sorting algorithms in a computer science class and the professor asked "Who organizes their bills numerically?" I raised my hand and he was like "I was using that example to show that you don't need to write an algorithm for something that small." Oops!
Plus, I have this thing where I add together all the numbers in licence plates and on houses as I go by.
I'm also have this weirdness with multiples of three. When I'm walking I'll notice that it's left - right - left then back to right-left-right. The way it switches when there's two variables I just think is neat.
I have a tendancy to look for patterns and focus on something until it's solved, reduce things to its smallest parts. Which is good for computer science but bad for rethinking conversations and situations over and over again.
I'm really realived that this thread is so long and I'm not the only one with these quirks.