Imagine you and the Marauders having a compartment on the Hogwarts Express
“Um, excuse you?” Sirius said.
“Yeah, what do you think you’re doing?” James asked, crossing his arms.
“This is our compartment,” you added.
“Sorry. You’ll have to find somewhere else,” Remus said apologetically.
“We always sit here,” Peter said, and gestured to the hallway. “I’m sure there’s another place somewhere.”
The poor student scurried out of the compartment, and the five of you piled in. “It is our compartment,” you said, resting your feet on Sirius’s lap and pulling out a game of Exploding Snap.
“Everyone knows that.”