your coworker, sipping his morning Monster Energy™, asks you, "how do German gamers say good afternoon?" you can hear your fingernails growing. he blurts out, nearly laughing, "GamerTag!" you black out. the smell of copper burns your nose. blue and red lights flashing. the walls stained maroon.
I'd pull a Biff and bring a sports almanac with me
It might work for a few sporting events until the Butterfly Effect kicked in more and more, considering how many countless tiny variables would slightly alter the outcomes more and more the moment you acted (and profited) differently.
You could also just buy bitcoin early on then sell it before it crashes.