I was baking bread for the first time in years the other day, and the instructions said put a baking tray full of water in the bottom of the oven. I didn't have a metal baking tray, so I put a ceramic ovenproof dish in the oven, and let it warm up. Then I boiled a kettle and poured it into the dish. DISASTER! The dish cracked immediately, spilling water into the bottom of the oven.
Obviously this was a dumb mistake. Next time I'll use a deep metal baking tray etc.
However, I'm trying to understand why this happened, because when I make a stupid mistake I like to fully understand what went wrong. I wouldn't have thought the temperature differential between the ceramic dish and the boiling water was sufficient to cause the sort of rapid expansion that would cause this to happen.