In Mario Kart 7, Wario Shipyard contains a "Banana Bounce Trench" where all bananas thrown into it will bounce for up to a minute before disappearing.
This is due to the invisible floor of the trench being mistakenly designated as a wall in the code, and bananas being coded to bounce off walls. Normally a banana will only bounce off a wall once or twice before landing on the floor, but if the floor itself is defined as a wall, the banana will bounce indefinitely until it despawns.
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