She certainly stops eating something if someone double dips. Thanks goodness she doesn't say anything until later and insists the food is disposed of. I guess she sees enough bugs/germs/ bacteria or whatever at work and knows what they can cause.
We usually make sure there are implements to use now.
In fact I was surprised last night, we went out to new friends house for dinner. She had a spoon in the nuts so that people didn't put there hands or fingers in the nut bowl. I was shocked at first, then thought what a jolly good idea. I had never seen it before.