I've had the same thing happen with toasters, and at least as of a few years ago it was completely possible for a piece of toast (of just the wrong size) to get stuck such that it not only didn't pop up, the toaster didn't turn off. So the toast starts to burn, you grab a knife, what could possibly go wrong?

This happened pretty regularly as it was a European toaster designed for perfectly uniform extruded wonder-"toast" and I kept sticking hand-cut slices from round loaves into it.