Erroneous childhood notions

When I was a kid, I had some misconceptions about how things worked. I'm sure there are lots I'll remember at another time, but here are some.

When I was very young, I thought that when you ate food, it went all the way down to your toes and would gradually pile up.

When I was six, I would see jets' vapor trails, and I believed that they were real clouds. That led me to believe that clouds came from jets, and that the sole purpose of jets was to put clouds in the sky. I never understood how they went from being straight lines to lumpy things, though. One day the radio announced that that day there was "not a cloud in the sky," and I remarked, "We'll be seeing a lot of jets today!"

When I was seven, I believed that lava was so hot that if one drop of it touched your pinkie nail you would die.

And then there's one that is the most implausible to me, and I was probably nine or so before I learned it wasn't true. I learned that in cel animation they had to draw every frame. But I didn't understand that they used cels and that they placed them in front of backgrounds. I thought that the entire screen had to be redrawn every time. And here's where it gets progressively more implausible. I thought that if they did that for movies, they did it for video games too. So every possible position that Mario could be, with any combination of enemies, had been individually drawn, including the backgrounds. And I liked the Mario Paint Super Nintendo game, so I believed that everything I ever possibly drew on Mario Paint had already been drawn before--also with every combination of cursor location. And then since they did that with video games, they did it with computers too. This means that everything you ever drew in Microsoft Paint had been drawn before--not just in Paint, but the whole screen, with every possible cursor, cursor location, window size, background image, icon combinations, etc. It hurts my head to think of all the combinations that would have to exist if that were true!