I have a number of them but they're more extreme than bizarre...
I religiously feel the need to clean my ears with Q-tips a few times a week or more even when I know it's over the top unnecessary and has no real benefit...but it's like a guarantee almost.
Same goes with foot health... I cannot tolerate poorly kept feet and go to great lengths to ensure they're regularly soaked in salt water and vinegar, nails are in their best shape, and there is no dead skin buildup or unsightly blemishes. Likewise I don't walk barefoot in public places where others do or use public showers without thong footwear.
...and most importantly, if a restroom doesn't have sensored taps or if they don't supply disposable paper towels for drying (good for shutting off a manual tap or exiting the room), or if the exit doorway requires the use of hands to pull the lever, I won't wash my hands there....instead, going back to my vehicle to fetch a hand sanitizer then clean the vehicle door handle when I'm done with my hands.
People are disgusting...