God learns a little about all of the aspects of the Impala..
Castiel and God sat in the back seat of the Impala, while Dean was sliding into the driver's seat and Sam was beside him in the passenger seat. Castiel, accustomed to ridding in the vehicle, reached back to pull the seatbelt across his shoulder. God watched curiously, and then did as her heavenly counterpart had done.
"I do not understand the use of these irritating straps," she said.
"Humans believe they save lives when one crashes their vehicle."
"Dean will not crash her, will he?"
Dean adjusted the rearview mirror to look at God. "Did you just call my baby 'her'?"
"I have become attached, Dean Winchester," she nodded.
He grinned, and then twisted the key, the car roaring to life.
God reached out and grasped the sleeve of Castiel's trench coat. "What beast chases us, Castiel?" she asked, her eyes wide. "Why does it shake her?"
"I believe that is the sound and motion of the engine," Castiel informed her. "It is normal."
God gave a sigh, and released his sleeve. Then, she turned her head and looked out the window as Dean backed up and started to pull out of the parking lot. She enjoyed the odd sensation of 'driving', as Sam had explained the term. Things moved past her quickly, and left her curious as to what they were.
Suddenly, sound began blaring from the walls of the vehicle. God did not think it to be dangerous, but she did find herself wanting to know what it was. She listened to it for a moment to see if she could identify it without the boys. There was a man speaking, able to be heard above the rest of the sounds. There were crashes, and wails, and bangs that God did not recognize. She soon found herself incapable, and turned to Castiel.
"What is this sound?"
"Good ol' rock and roll!" Dean crowed from the front seat. He began shouting along with the man whose voice came from the walls. God was still confused.
"It is music," Castiel explained, seeing the ignorance on God's face.
God nodded. "But what is its purpose?"
"It does not have one, if I understand what I have been told," he shrugged. "I have seen many humans use it as a source of entertainment."
"Is all of it this loud?"
The music ceased, and God looked to see Sam pushing a button beneath the glowing runes. Dean snarled at him, but he ignored his elder brother to turn and smile at God. "No, it's not."