Sam

Think of the biggest thing on Earth... an elephant? No. Now think of the biggest thing in the galaxy... the Sun? Not that either. Now think of the biggest thing in the universe... Hercules-Corona Borealis Great Wall? Damn either your a scientist or a googler. Either way not that either. I'll tell you what it is. Sam. Sam is so gargantuan you wonder how so much mass can be stored on the human body. You even question if it is human. Think of Sam as the atlas of the world, but instead of a ripped chad, a huge inconceivable lump of fat and grease holding up the universe. Paradoxically, his mass is larger than the amount of literal atoms in the entire universe, giving credence to his name Sam, backwards Mas(s).

Pub quiz question: What is the simplest yet largest thing?
You: Space?
Pub quiz question: Nope, it's Sam.