Apparently birds don't like round cages, which is evident after this cockatoo launches into a series of F-bombs after her cage gets destroyed.
The sad bit is that cockatoos mimic what they hear, so clearly someone went on a rant (probably many rants) similar to this with the bird nearby. The guy in the video is not the person who taught Pebbles that language. He rescued Pebbles from an abusive home and then saved her from that round cage.
Here's some more of Pebbles ranting (with subtitles.) Whoever she lived with last must have been a real peach.