This kind of gives an example of Rocky's fake biting feet. If you listen closely, he screams a bit (in joy) when he "bites" Thomas's foot. There is also a bit of macaw laughter.
At the beginning of the video, he was hiding under the cart where we keep the parrots' food. This is one of his favorite ambush spots.
He has done this to me on occasion, when I am distracted and he sneaks up on me, but my fear of an actual bite is too great.