That's easy! I saw it on TV!
I was probably seven or eight and my family was on vacation at the shore. They decided to rent a pony so I and my two siblings could have a little ride.
“I don’t need you to hold it for me,” I said. “It’s easy.” I’d seen people ride horses so often on TV that I knew exactly what I was doing.
So they gave me the reins. I gave a little kick and the pony started walking. The pony’s gait caused my legs to bounce a little on the pony’s sides, so the pony started trotting. My legs bounced a little more, so the pony started galloping and after that my legs couldn’t bounce any more because I was lying on my back in the sand.
Did you ever “learn” anything on TV (or the internet) that didn’t turn out to be the same in reality as it was on the screen?