The video likely worked due to its unexpected and absurd premise of throwing a rabbit off a roof in a crate, combined with the surprising outcome of the rabbit being unharmed and the creator's exaggerated reaction.
Summary
A person on a roof places a wooden crate containing a rabbit into a larger wooden crate. They then close the larger crate and throw it off the roof. The crate lands on the street, breaks open, and the rabbit is unharmed.
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Transcript, structure and on-screen text
5 beats and 2 lines of on-screen text — the parts you need to write your own version.