plot hole you can drive a truck through

A plot hole of such immense proportions, that you could drive a proverbial eighteen wheeler through it.

"How did Harry go back in time and save himself, nothing would've happened, he would have lost his soul to the Dementors already, right? I don't get it."
"Magic."
"Really?"
"No. It's just a plot hole you can drive a truck through."

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