During my time on MN I have read about some disgusting/unhygienic things that people do on a regular basis.
Examples are:
Letting dogs lick human plates
Washing dog bowls in dishwasher with regular dishes
Sharing bath water (seen this one today!)
Sucking snot out of a baby's nose (I somewhat get it but really think I could never)
What are some vile things you've read about on MN that are seemingly normal to those that post about them?