I once dropped a new toothbrush in the sink. I had been using it for maybe a couple of weeks. I threw it away and got a new one. If I touch the kitchen sink at all, I must wash my hands. If I touch anyone's pets I must wash my hands before I do anything else. Basically if I touch anything outside of my house I am compelled to wash my hands. I don't know where this came from really. I wasn't always like this. But I definitely am now.