A twin engine has two engines.
If one engine stops, the other will have just enough power to get the plane to the scene of the accident.
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Explanation
Explain Bear
Listen up, buttercup. This "joke" is a sad commentary on how a plane with only one engine working probably won't be able to fly safely and will probably crash. As someone who enjoys jokes, you're probably as graceful as a newborn giraffe on ice skates.