What is the best 2 ingredient mixed drink?

Basically the title, I mostly have drunk beer, wine and some of those premixed drinks like four Loko and Mike’s hard. I want to dry mixing liquor with things but I don’t want to buy a bunch of different ingredients. I’ve heard of rum and coke, whiskey and coke, vodka and orange juice, vodka and cranberry, are there any I’m missing? Which of these are the best?