After that first burger, he started collecting burgers and leaving them in (iirc) his basement with the year purchased noted on each one. None of them degraded significantly over many years. That stuff isn’t food. I haven’t seen that video in ages. It’s super creepy. I also saw a video of a guy that put some fast food on the sidewalk to see what the insects would do. None of the insects touched it, because, it’s not food.