Die in a Warp Box

To perform this glitch, Mario needs to go to the airship of World 2. Then, he should enter the first Warp Box. The player should reach the end of the bonus airship, but Mario should not enter the Warp Box at the end. Instead, the player should press the left camera control button so that the camera turns to the left. Wait until the Warp Box is offscreen then immediately go inside the box before Mario loses a life. If performed correctly, Mario should lose a life while the camera pans back to the main airship.

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That's a weird glitch, I never seen that happen before...