If you run around naked at 88 miles per hour in circles with a boner, it's theoretically possible to penetrate your own anus, thus creating a stable time loop of high speed hyper cyclone buttsecks.
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But what if you fly naked at 100Mph? ( ͡° ͜ʖ ͡°) [spoiler]Infinite Super Self Penetrating Buttsecks?[/spoiler]