All joking aside, the biggest danger is actually fire. The thing is, most leaks are typically tiny, and almost impossible to see dribbling down a wall in a dimly lit space. If such a dribble runs behind the face plate and over the contacts it erodes the contacts at an accelerated rate - within days a clean contact can oxidise to the point of being a blunt lump of rust, which will generate huge localised heat without breaking the fused connection.
And that's when water and electricity causes a fire. Conversely whilst the presence of water does greatly increase the chance of you getting a shock, it hardly ever leads to serious injury or fatality as water is actually a really, really appalling conductor. It also has the habit of running downwards and is already finding better paths to earth than you could likely offer by sticking your finger in its path. The truth about water and electricity is that it's dangerous not because it conducts, but because it can go anywhere. I've made a career and living out of containing water safely in the most awkward of spaces, and I hate the bloody stuff!!