Cauliflower and exploding pyrex

I started a lovely lunch today, with a base of instant brown rice that I cooked in water where I had placed about a tablespoon of parsley from my garden that I had stowed in the freezer. I made some Green Giant frozen cauliflower in cheese sauce, planning to serve that on a bed of rice, with some slices of Morningstar vegetarian Italian sausage. I started the tea pot for some almond tea as a beverage and while I began to assemble the final meal...

POP!

I had turned on the wrong burner and my large 11 x 7 pyrex dish exploded all over the kitchen. Thank goodness it narrowly missed the food...