What is a theory you have backtracked?

We all know what makes us conspiracy theorists different than others is that we have open-minds and recognize the falsehoods in the MSM. But part of having an open-mind is being able to admit when you are wrong. I’d love to know what are some of everyone’s theories they have UNSUBSCRIBED from over the years are?

I’ll go first, Flat Earth. Yes at the risk of embarrassing myself, I heavily subscribed to this up until a year or so ago.