The medikit from Harry Harrison's Deathworld series. A small device that you press against your skin, over a wound, which would then test your blood and administer antidotes and antitoxins depending on what was found at the site and in your blood.

I know it's nothing flashy like a teleporter or a flying car but the idea that you can treat any bite or sting (fatal or otherwise) in literal seconds really resonates with me.

Who knows? Maybe we'll have these in our lifetimes

"pow" Age of Empires (2 - I think)

Me and my little brother used to play Age of Empires on my dad's work laptop some 20+ years ago. Pressing Enter and typing "pow" without the "s spawned a unit that was a baby on a tricycle. Super powered but you had to be clever with it as it could be converted by enemy priests. Those were the days.

Also, for extra credit - up,down,up,down,left,right,left. I don't know what game it was from but I do know it isn't the Konami code misremembered. This code has permanent residence in my brain