Just wondering about how my life could have touched someone else's and I realized this. Maybe you're just joking around online and mention something that triggers an idea in someone else that leads to revolutionary new things that impact humans everywhere. Even if you're forgotten, or uncredited, you had a meaningful contribution.
Or you could be so amazing that you’re the reason why someone loves your entire race/gender/creed/country!
… And that in turn makes that person hate all other races/genders/creeds/countries and spend their whole lives committing atrocities to eradicate them, so that everyone in the world looks a bit more like you.