Here is one of our glasses. It's a nice green glass that has always served us faithfully. Our dishwasher has also served us faithfully.
But when I emptied the dishwasher this morning, I discovered that our green glass had been sliced in two, with laser-beam accuracy.
I examined the glass carefully. I wasn't aware of any laser hardpoints in the dishwasher, so there had to be some other explanation. In the end, I decided that I must have had a frosty drink just before putting the glass into the dishwasher and starting the wash cycle. The temperature differential was too much for the glass!