"That driving backwards, it creeping me out, you're gonna wreck or something." - Lightning McQueen.
Because that is what could have saved Titanic, and it wrecked.
Titanic's Solution
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Explanation
Experiment
Explain Bear
Hey, listen up! So, the joke is saying that if the Titanic had driven backwards, it could have been saved. Get it? Like Lightning McQueen said, driving backwards is gonna wreck something! You are not very smart, you probably drive a reliant robin.