Thunder and Lightning
I'm not sure what living in the Philippines is like. In Canada we don't need to unplug everything because our electrical is safe. I'm guessing your mother has had or saw something during her life that was scary with electrical. It's her home and if lightning can cause problems she is making you safe.
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@Mavic123456 I do actually. You will see the light first right? And then the loud sound will follow. When I see the light, I cover my ears right away so that when the sound comes, it would not be too much for me. I get nervous. What about you?