I figured it out. Someone strapped filler to a chair and is forcing him to look at Bowsette memes against his will.

I'm shocked he's survived this long. A normal person would have died from that much exposure but filler is one tough bastard. We need to move as fast as possible. Call all of filler's friends, contact his parents, figure out his last known whereabouts. I've already got the FBI on the phone but all of us need to help and work together.
We're going to save you, filler.