Miracle, possession, or ... other?!

This is a shattered pot lid. I didn't cause it. My girlfriend didn't cause it. We can't imagine what caused it.

I was sitting on the other side of the room, putting together some furniture. She was washing some dishes. We heard a 'pop' like a champagne bottle, and both thought to ourselves "...we don't have any champagne, what was that?" We opened the cupboard and saw this, with a fine spray of glass dust covering things. For the next hour, we could still hear it cracking constantly!

The lid was put in the cupboard about five minutes earlier, in this exact same position. It did not move at all. Previous to that, it was sitting in the drying rack for about a day. That rules out thermal causes. It didn't move, so it didn't drop on anything (or vice versa).

Any other scientific minds out there care to take some guesses?