An amusing variation is to leave a couple of mugs on one ring, and turn that ring on, instead of the one with the pan of soup on it.

A few minutes later, become intrigued by the way the lower reaches of the mugs are turning brown and their glaze is crazing over, while the soup is resolutely cold.

Pick up a mug to investigate.

Run fingers under cold water tap.

Clear bits of mug off floor.

Have cheese sandwich instead of soup.

Personally, I blame whoever invented smooth ceramic hobs that just beg to be used as shelving.

Rik