Explain the pun an angry bird landed on a door knob. then flew off the handle

A pun is a form of “word play” that suggest two or more meanings by using words with multiple meanings, or words that sound similar. In this case, the meaning of 'flew off' is not precisely to take flight, but rather to become very angry. The purpose here is to change the meaning of the sentence for a humorous effect.

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.

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