"RAWR!" Sirius pounced onto James, whom until that point, had been sleeping quite peacefully.
"Sirius!" Yelled James, pushing Sirius off his body. "What the hell do you think you're doing?"
"I'm trying to scare you." Said Sirius, as if he had just said 'we go to Hogwarts' or 'the sky is blue'.
"What the hell are you wearing?" James flicked on his lamp beside him, illuminating Sirius in what appeared to be a werewolf costume.
"Do you like it?" Sirius turned around. "This baby has been waiting for years at the bottom of my trunk to be used."
"Years?" James's eyes bulged.
"Yeah, I got it the month after we found out about Moony's furry little problem." Sirius was grinning.
"Go to sleep, Sirius." Butted in Remus from the dark.
"I second that." Agreed Peter. "It's three in the morning."
"Yes, sir!" Exclaimed Sirius as he wrapped himself up in his sheets, still wearing the brown and tatty costume.
Sirius certainly did get a lot of strange looks when he strutted down to breakfast like that the next morning.
The Marauders weren't sure how often Sirius showered. They all assumed that he used a cleaning charm.