Loud crashing sounds and arguing were a normal backdrop for him, but usually not when he was sleeping. And usually not close enough that he wasn't able to go back to sleep, forcing him to get up and go out in the hallway to find the source of the problem.

Klaus looked like he'd gotten to it first, but once Leo saw who the instigators were, he lost all sympathy. "YOU MOTHERFUCKERS! I'm trying to sleep!!" He yelled, and tossed the nearest thing he could at Devin's head-which happened to be a book. "Stop fighting or I'll kick both your asses!!"