In my attempts to befriend Rocky (which I suspect are futile), I have started rubbing his feet when he is in his cage. He does seem to like this and will often start making these purring-like noises. However, during the past couple of weeks, he has added a new dimension to this game. I have attempted to capture this in a video, but it's hard to do when I'm filming. I think you can get the general idea from this video:
He sticks his foot out to grab my finger, then he tries to bring my finger to his beak. When my finger does not go through the cage, he instead bites his leg. In the video, he wasn't able to grab my finger (my depth perception was apparently off), but you can see him stick his lower leg through the bars, and then a few seconds later, you see him make a half-hearted attempt to bite his leg.
I got to work a bit later today than anticipated due to Andreas. He was glass-dancing and running around his enclosure. Since I understand how frustrating it can be when you have excess energy, I let him out to run around the house for about 10 minutes. He loved it! I don't do this very often, so all of the parrots were enthralled by him. They kept moving around their stands so that they could get a better view of him, and Max was gently swaying back and forth.