We do low-cost bird grooming at the local bird club meetings, and when we get a cockatoo who's not happy about the proceedings I'm surprised that people two blocks away don't call the cops to report a murder in progress. They are LOUD.
My vet told me that when they're dealing with an unhappy macaw, they have to wear earplugs to comply with OSHA standards for workplace safety. That probably goes double for 'toos lol.
Cockatoos are gorgeous and I love them, but they have high-strung personalities and really do require more interaction and entertainment than other species. They will go nuts if they don't get it, meaning long-term problems with screaming, plucking, biting and fun stuff like that. The males are notorious mate-killers in a breeding situation, which I haven't heard of with other types of parrots. I've heard some people say that Moluccans in particular probably shouldn't be kept in captivity because they have so many problems adjusting to it.
The mini-cockatoo that most of us have is a lot easier to deal with.
This is what it looks like at my house when I'm handing out millet spray or sunflower seeds:
