By strange things, I mean things you do for your own reasons that are unusual, unordinary, or just don't rationally make sense. As my example, I usually wear sunglasses whenever i'm outside during the day regardless of the weather. While it is mainly for eye protection, I also do it because I don't like it when people I don't know or fully trust can see into my eyes.
There's an old quote, "The eyes are the windows to the soul". While i'm fully aware that whoever wrote that was probably speaking figuratively, I feel like there's some literal truth in it...someone's eyes can tell a lot about them, and I don't want people I don't trust seeing too much through mine.
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I have dermatophagia (biting my fingers and inside of gums, apparently it's a form of OCD). I also have OCD-ish tendencies towards computers. If they aren't running as fast as they possibly can be (because of lots of start up programs, useless bloatware and all that), then I have to fix them, which is why I hate my mother and brother's computer.