Before I switched to CS, I was in a EE program. Our intro to engineering class was filled with stuff like the outdoor decorative fountain that killed six people one at a time, and the transformer box that was used in a game of hide + seek (the lock was missing).

In the case of the fountain, several couples had had a night out and decided to splash in the fountain. The first two knocked a power conduit for one of the pumps loose, electrocuting themselves. The others died as they each entered the fountain to rescue the others. The system lacked a GFCI protector.