There are two microwaves in my office kitchen. Beside each of them, there is a sign saying "Please use a paper towel if you don't have a lid". Apparently people have taken that to mean put a piece of paper towel in the microwave, put your container on top, and microwave it uncovered. So now there are layers of bits of baked-on paper towel covered in food spills sticking to the bottom.
Who raises these people?