"When like a car is perfectly balanced so that it doesn't fall of a cliff, a bird lands on the front and makes the car fall of the cliff." While it necessarily happens in cars and in elevator, example can be of dams and such. A example would be Beetlejuice where the husband and the wife survive the crash but then a dog enters and walks on the opposite end of the plank supporting the car and cause the car to fall in water killing the husband and wife.
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