Mathematicians and hygiene

While I was doing my business in a public washroom (I will leave it to your imagination - and won't go into further details), I witnessed two of my colleagues (Bachelor/Master's/Ph.D or even possibly professors) go to the washroom, do their business, and leave without washing their hands... Argh!

Please people, wash your hands... It's not just better for you, it's better for everyone...

This was a two for two, it wasn't 50% success/failure rate, so that's a bit troublesome. And don't give me the whole, it's only two people, so you don't have a representative sample. the point of this post is about health, not math.