Stop Hitler’s parents from getting together in the first place.

I’m heading far into the future - say 1000 years or perhaps 100 if communication would be an issue. I’m going to grab all sorts of portable devices and tools to take back with me, and I will maintain the remainder of my life without sharing my goodies. The world is screwed because they get no fruits of my intense labor, but that is fine since I hate them anyway. For that afternoon of work, I get to live a great life while everyone else must suffer in modernity.

I hate the ‘hate’ part (pardon the pun) of the question.

I’d rather go back in time and get Jesus and bring him back here so that he can go all ‘temple money changers’ on today’s MAGA Christians asses, give them a proper yelling to.

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You’re going to pretend we’re not on that timeline right now? I see your play, time traveller.

Hmm I don’t know. Probably go back to Germany 1940 and give them all the information needed to develop nuclear weapons first. You just know that Hitler would’ve pushed the red button a hundred times over if he had the chance.

Go back to 2011ish and unleash WanaCry on a world that is not ready for for a global crypto locker.

Procrastinate, the world is going down the drain just fine without my help.

Wait until I’m about to die, then go back to when the first land-dwelling animals first started coming ashore. I’d bring a bunch of cockroaches with me and then I’d die there. Either the roaches or my decaying corpse will hopefully cause enough change to the timeline that humanity never develops in the first place.

I think that’s the most I could screw over the (human) world.

Go punt kick the first fish back into the ocean as it tries to waddle it’s fat ass out of the water.

I know that’s not how evolution works but I can dream… Life would likely be vastly different given such a long period of time with something like that changing either way.

Shoot Arch Duke Ferdinand. Few people even now about it today, but he was subject to a horribly mangled assassination attempt that many scholars belive would have set off a major war in Europe had he died.

I kill Dr Morell before he meets Hitler.

I’d kill Harambe. Wait a second…

I could skip my next union meeting, I guess…

I really like this question. So: rather than killing Hitler, what if, instead, you killed Stalin? Was it inevitable that a strongman dictator would have taken over, and ruined the potential of communism? I guess we have evidence that the answer is “yes,” in the form of Mao, but weren’t the Chinese communist party(s) greatly influenced by the Soviet model? What if Russia had, instead, developed a more democratic system of government - was it possible, and couldn’t it have affected how China’s developed? But, maybe it is always inevitable that dictators emerge from internal revolutions like this.

Here’s another scenario: what if you stopped Oswald, and prevented Kennedy from being assassinated? He was popular, and likely to win a second term. What would 4 (~5) more years of Kennedy look like?

I’d kill my parents before I was born.