Most animals hate going to the vet, but the way Max the cockatoo reacts to hearing that he has to go to the vet may prove that he hates having to go visit the hospital more than any other pet out there.
At first I found this cockatoo's cries alarming, but actually "screaming" is perfectly normal for cockatoos. According to Cockatoo-Info, screaming is a natural part of cockatoo life and it's how they communicate with each other.
If your cockatoo is screaming too much, there are solutions to this problem. Possible options include finding your cockatoo a friend, providing it with some toys, or getting him/her a larger bird cage.