My GCC, Callum, does so many adorable things. As a user mentioned before, I'm sure it's a "if I be cute, I get something awesome." sort of deal.
Despite being flighted, he loves to waddle around on the floor and eat stray rat food, or food he's chucked out of his cage. If I'm sitting on a chair and he isn't on my shoulder, grooming my hair, he's picking at my toes. He does this with guests as well. I have a case manager and she has a toe ring. He was infatuated with her toe ring!
Of course, there's the begging. If I'm eating something, he tries to steal a bite from me. He had some steamed white rice last night and he didn't know how to eat it. He couldn't hold it well enough, so he get set it down and munched on a few grains at a time.
If I'm drinking water out of a bottle, the evil green cap must be attacked.
If I set anything down near Callum's cage, he must crawl out of his cage, throw it from his area onto the floor, and then go back to his cage.
Despite having a perch at his water bowls, he has to dip his food in his water bowls while he is hanging from the side of his cage, upside down.
If I sneeze, a screaming fest ensues. Then I laugh with his screaming and then he does my cackle back at me, which then causes more cackles from him. I can't tell you how many guests have been cry-laughing because of Callum's cackles. He also know if he cackles, it'll get me to cackle more, so he then cackles even more.
If I'm laughing really hard at something, I don't really make any noise for a little bit (I know, I'm weird), so Callum will cackle for me.