Later, Lou tries to win a sure-fire bet on a football game, the outcome of which he remembers in detail, but loses. How? Because of that same goddamn squirrel, which was apparently so agitated by the vomit incident that it disrupted an NFL game like a common Philadelphia sports fan.
That being said, recent experiments in the field of quantum physics have found that the Butterfly Effect, in regard to the flow of time, may not actually be a thing. But regardless, from a narrative standpoint, movies so often present situations in which time travelers are able to alter the future through their actions in the past, but the extent of these changes is shockingly minor. Like in Back to the Future Part III, Marty and Doc disrupt an entire train route in the Old West, and it is of seemingly little consequence to the future. Not to mention how the protagonists of both the old and new Quantum Leap spend long stretches of time in the past and only end up changing the things they intend to. For all its other faults (and there are many), at least Hot Tub Time Machine adeptly illustrates the futility of trying to predict the future of a timeline one is in the process of disrupting.
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Top Image: MGM