I have a wierdo in my family that can't have the TV or car radio volume left on an odd number...
The notes in my wallet have to be in order, 20s at the back, 10s in the middle, 5s at the front. With coins, If I have them in my hand I have to arrange them so they go from the largest diameter to the smallest.
I also hate being late, to the extent that if I have to be somewhere and there is a train that gets me there in time, I get the earlier one.
This is exactly the same as me, it is really starting to annoy me now...If I accidentally bang my elbow on something, I have to bang the other one. Immediately.
The consequences of not following this ritual are unknown, but dire. Therefore it MUST be done.