My laptop has to be perfectly aligned on my desk and the mouse wire has to be tucked behind the laptop before I can game online. If I notice one or the other is not in place it will annoy me a lot and make me lose concentration.
I have to complete a full series of things before I leave the house, including washing my face, moisturizing, brushing my teeth, putting in contacts and fixing my hair. If I miss one I will feel self conscious for the rest of the day.
I sometimes squeeze my hands in my armpits when I'm excited or hum a victory tune (only in private though).
I'm terrified of spiders (only the big hairy ones) and sharks (big ones).
I sometimes convince myself there's a person standing in my room at night and no matter how hard I try to dismiss the idea, I always end up reaching for the bedside light switch.
