Even though pure water isn’t very conductive, it is very rare to find pure water. Swimming pools, for example, contain lots of chloride (which *does* conduct electricity), which is why it’s dangerous to go swimming in a thunderstorm. The water from your faucet, meanwhile, has a number of added minerals, most notably fluoride, meant to help keep you healthy. Unfortunately, those added minerals also conduct electricity, so any live wire submerged in tap water will electrify the whole area of the water. Now, most of our appliances are designed with this in mind, and very few have any way to expose a live wire without actually destroying the appliance first. However, since toasters are reliant on live wires to, well, toast things, it’s next to impossible to design one that does not expose this wire in some form.
Toaster has live wire exposed, toaster goes in bath, water hits the live wire, water gets electrified.
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