Note to self: when melting butter in the microwave to use over popcorn, do NOT set microwave to high.
Luckily, our microwave is from 1987 and thus built like a tank. In order to destroy it, you'd actually have to stick a smaller microwave inside it and activate the two simultaneously. This would, of course, tear a hole in the space-time continuum, destroying the universe as well as the microwave. So don't try it.
Here's a close-up of the carnage: