Last time I went grocery shopping, there was a rather dirty looking fellow inspecting apples, touching them. He then proceeds to reach in his waistband and in his underwear to scratch his ass. He then goes back to touching and inspecting apples. I feel sorry for anyone that didn't wash their apples that day, haha.
Also see lots of people picking their nose, teeth, ears, pimples...while checking out produce. I wonder what goes through their mind? "I'm touching fresh vegetables, better get that crap out my nose".
I also like how some shoppers will get some meat out of the cooler, and at some point decide against getting it and put it on some random shelf, where you find it all leaking and rotting at room temp.