I used to think the moon landing was fake because of the flag waving, but a friend showed me something that made me feel dumb

For years I was sure the flag moving in the video was proof there was wind, so no space. I argued about it online all the time. Then my buddy, who's a welder, had me over to his garage last month. He had a piece of thin metal sheet, like the flag material, and he just tapped it. It kept wobbling for a solid minute after he stopped, with no air moving at all. He said in a vacuum with no air to slow it down, a little movement goes a long way. That one simple demo in his garage in Daytona totally flipped my view. Now I feel like I was just repeating stuff I heard without really thinking. Has anyone else had a simple moment like that change a big belief for them?