What was the oddest belief you held as a child?

I don’t mean religious wise…more along the lines of life in general. Was there something strange you believed as a child and then as an adult look back upon and go “what was I thinking?”

For example, as a child, I believed that wind was caused by the earth’s rotation. Whenever the earth moved, wind formed. Of course now, I wonder why the fifth grade science class never sunk until way later.

So what about you? What were some odd notions you accepted as fact when young, but now know to be ridiculous?