god i hated these, luckily i outgrew most of them.
I always tried to be a perfectionist, but I was a lazy one. So I would try to be perfect, but eventually I would get lazy and fuck something up. Then it wouldn't be perfect anymore, so I would give up.
For example, when I used to brush my teeth, I would brush each side of every single tooth for a specific time. I would get this time from my age. So if I was 10, I would brush each side of my teeth for 10 seconds. That eventually led to me brushing my teeth for 10 minutes, so I just gave up on that, so I just never brushed my teeth.
I did the same with shampooing my hair, except I would multiply my age by my age. So 10x10 = 100. I would let the water run through my hair for a 100 seconds, I would rub shampoo into my hair for a 100 seconds, and I would wash the shampoo out of my hair for 100 seconds.
I also did that with combing my hair. I would comb my hair in 45 degree angles, all at 100 seconds each.
Anyway, I grew out of that shit. The only thing that I still do is when I have to shake something up or etc. For example, if I make myself some tea, and pour some sugar in, I mix my tea for 15x15 = 225 circles. If I'm eating yogurt, I shake the yogurt up 225 times before I eat it.