Yeah, he's bit of an ass but I always liked Corey Feldman since Stand By Me. Not as much as River Phonix and like everyone else my very favorite character in the film was Lardass but he was good too. So much so to this day, when I think of 'em, I still think of his nutty character with a melted ear. Liked 'em in The Goonies as well but of course Chunk made that movie.
He's one former child actor who grew up without going batshit crazy, at least by today's standards. But who knows; maybe he decided to delay his psychosis till now and we're seeing the signs of a man about to start that tortuous journey to the rock bottom many former child actors typically experience in their 20's; 40 is the new 20 after all. A horrible auto-tuned, overly engineer pop song has pretty well become a right-of-passage for Hollywood fixtures himself; that's not the malfunction. Rather, the very fact he shot a video mimicking Michael Jackson is what I find very disturbing.