Although stop-clocks may seem very boring and mundane, the good thing about the electronic ones in the science block is that they may be connected together by means of wires between stop-clocks. These enable all sorts of strange things to happen when the buttons on the stop-clocks are depressed, depending on the connections between the stop-clocks. For instance, pressing the stop-start button on one, may reset the other, or vice-versa. Connecting stop-clocks like this is a wonderfully fascinating activity, and a way to waste an awful lot of time (during chemistry lessons McJob).