The purpose of the pun about this angry bird is to change the meaning of the sentence to have a humorous effect on the audience (readers or listeners).
What is a pun?
A pun can be defined as a literary device that suggest two or more meanings, especially based on the use of words with different meanings but have similar sounds (homophones).
In this context, an angry bird landing on a door knob describes the current emotion of the bird (anger) and it flying off the handle simply means that it became more angrier.
Read more on pun here: https://brainly.com/question/16017814
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