I don’t even know if I can link the video here (as it’s a porn website), but here you go.
At around 2:26, there is a video of someone falling onto a car. Obviously, this is not from 9/11. But what follows shortly after are clips from 9/11, which could have led to the confusion that it’s from 9/11 and thus creating a false memory.
All credit to Reddit user Illustrious-Orchid90 who found this. So as you see, it makes sense to look out for gore content on (hardcore) porn websites in order to find 9/11 related material.