I love cockatoos! My dad had a Gahfin cockatoo at one point named Sadie... she was the coolest bird in the history of birds. I would lay on the couch and she'd hop on my belly and roll on her back because she wanted me to scratch her neck and rub her belly. SO cute!!
When she wanted attention and I wasn't laying on the couch she'd do this little dance where she'd put up her feather thingy and then bob her head up and down while she swayed from side to side... it was her version of saying "HEY! OVER HERE! HEY! ME! ME! ATTENTION NOW PLZ!"