While we're talking about "interesting" situations.... this is my propeller de-ice boot after a night flight in bad weather. At some time previously, the boot had been struck by a rock or something like that, and the two layers of metal had been compressed together to cause a short. It happened that the first person to use the deice boots was me, and of course it happened in cloud at night. We had a real shower of sparks going, and the prop looked like a pinwheel. The doctor in the back noticed the sparks going down the fuselage past his window! Fortunately nothing more serious than a couple of hours fixing it the next day, but it could have been much more memorable if the boot had delaminated and caused an imbalance with the prop. That could easily have neccessitated an emergency landing (at night, in bad weather!). It pays not to dwell too much on some of these possibilities though....