Bang in the Sky
It’s interesting how some lies are told so often that they become universally accepted “facts” all over the world. Back when we were kids, most of us believed that thunder was created by clouds banging together. That’s what this OP’s parents told her as well.
In fact, it wasn’t until she spoke about it in front of her 8th-grade science class that she realized how wrong she was. Apparently, she ended up becoming the laughing stock of the class. That’s unfortunate but hopefully, she now knows that thunder is caused by the rapid expansion of the air surrounding the path of a lightning bolt. Yep, we looked it up.