"Uh, yeah," Sam said, not entirely sure how much information Dean had given the doctor about their line of work. He shifted on his feet. "It's sort of the family business." He cleared his throat and fell back on the usual deflection. "What do you do? When you're not building sonic modulators."
Sam obeyed without thinking about why, sliding his eyes shut and then opening them a minute later. "No sirens."
He grinned even as he wondered what had made them stop.