Everyone is trying to connect the likelihood of lightning itself being the danger, but also consider what else happens during bad storms.
Power outages.
If you’re in the shower or bath during a power outage you’ll lose all light, and while most bathrooms do have windows to let in outside light those are likely darkened due to the storm itself. So now you’re soaking wet and attempting to transition into or out of the shower or bath, which is the most dangerous part of the entire process, in near complete darkness.
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