So, I've recently fallen into a rabbit hole of the Paul is dead conspiracy. Simply said, Paul McCartney presumably died in 1966 in a car crash, and got replaced by a lookalike.. The theory has gained LOADS of attention over the last 2 decades with tons of 'evidences' proving, disproving it etc.
Personally, I don't believe in this theory, but I find it immensely interesting. I did a deep dive not too long ago and came across a photo that, for the life of me, I can't find anything about it. It's presumably Paul after the crash, but it's so unclear. It also kind of looks like a prop.