Not really OCD ( I hope ), but I wash my hands after using the bathroom and before touching food and food related items.
It really bugs me when I hear someone flush after a #2.. then the sound of the bathroom door being unlocked a split second later. That person obviously didn't wash their hands.. they then proceed to the kitchen and start handling stuff. :/
So, if I want to make a sandwich, I have to disinfect the jars ( jam , mayo e.t.c. ), wash hands, untie the bread wrapping with left hand, grab slices with right hand, rinse hands, make sandwich, pour tea, put everything away, wipe down counter, rinse hands, eat.