"SAAAAAMMMMMMM!!!!!"
"DEAN!" Sam dropped the shirt he was packing and raced into the motel parking lot. "Dean! What...?" He stopped dead at the sight of his brother, apparently unassailed but with a supremely pissed off look on his face.
"What the hell did you do to my car?!"
"Car? What?" Looking passed Dean, Sam saw the Impala, still parked where they left her, but now neatly and completely wrapped in cling-film. "What the hell?"
"Yeah that's what I want to know, Sam." Dean starred at Sam, accusation in his eyes.
"I didn't do it!" More murderous starring. "Dean, I was with you the whole night! When would I have time to get that much cling-film, let alone wrap the whole car in it?" Dean looked at the Impala contemplating what Sam said. It was true, Sam had been with him the whole night. That didn't make him any less pissed though.
"Well if you didn't do it, who did?"
Sam shrugged, opening his mouth to answer but then shut it again with a huff. Dean apparently had more luck coming up with a name and pulled his phone from his jacket, dialling with more vigour than strictly necessary.
"Cas, you sneaky son of a bitch! Get your angel butt back here right now or I swear when I see you..."
"I'm here Dean. What the problem?" Cas materialised next to Dean with an air of calm innocence. Dean snapped his phone shut and pointed at the Impala, anger preventing him from actually speaking.
"What happened to the car?"
"You tell me Cas." Dean starred at Cas, wishing that looks could kill. "Fix it, or you will wish you were back in angel prison!"
"It's a joke Dean, it's meant to be funny."
"CAS!" Dean clenched his fist and raised his arm threateningly.
"Ok, I'll fix it! You don't need to get violent." Cas raised his own hand, palm towards the Impala and the cling-film vanished, leaving the car unscathed. Dean gave her a quick once over to make sure she was, in fact unharmed, then stood before Cas, placing a hand on the angel's shoulder.
"If you ever touch my car again, I will kill you."
"You can't kill an angel Dean, only another angel can."
"Yeah, but I can sure as hell try! Just stay away from my car!" He gave Cas one last stabbing look before turning and stomping back into the motel, swearing profusely under his breath. Sam, who had watched the exchange in contained silence, burst into uncontrolled laughter as soon as Dean was out of sight. Eventually he calmed down, leaning against the motel wall.
"How was that?" Castiel asked.
"Perfect!"