Couple possibilities here
- he had a butt load of plastic surgery
- he completely lost his mind
- he completely lost his mind and also had a butt load of plastic surgery
- he’s doing a bit and messing with people
- he’s had a butt load of plastic surgery, lost his mind, and is doing a bit to mess with people
- this is not Jim Carrey, but a clone, because the real Jim Carrey had too much plastic surgery, lost his mind, and was doing too many bits