Crafting table and furnace

Water bucket and lava bucket
The nether and the end
Butter free and beedrill
Metapod and kakuna
The list goes on and on

lava nether

don't forget furnace and crafting table

Water, and bucket

Crafting table and furnace

minecarts and camman16

yall are ignoring the best duo out there.

Peanutbutter and jelly

Img and flip

Mario Luigi, ash and Pikachu, Brian and Stewie, lemu emu and douge, I'll wait

Gun sword

here's a more iconic duo

woody, buzz. firey, leafy. mr. incredible, elasticgirl.

Ender Pearl
Blaze Powder

Sand and Water

Wood and cobble?
Steve and Alex?
Those are the only better ones I can think up…

rick and morty