A/N: I'll get back to the conversation between the Doctor and Jane, I promise! Until then, here's some of Jane tagging along with the Winchesters. I think something like this would have to occur if they ever interracted.
Scissors
"I'm no expert, but that looks like a tight space."
"Thank you, Mr. Obvious."
"Dean…"
"What?"
"It's alright, Sam. Please, don't let me get in your way. I'm here merely to observe."
The Winchesters shared a glance. One rolled his eyes, the other shrugged, but both turned their flashlights back on the grimy air vent that was indeed a 'tight space.'
"Go on, Sammy."
"No way, I went last time."
Before the dispute could escalate, Dean thrust his fist forward, his eyes locking onto his brother's in challenge.
"Seriously? We're not kids anymore, Dean."
Dean tilted his head, his fist firm in the air between them, his eyes intent. Scoffing in disbelief, Sam put his own fist forward and in sync they played a short round of rock-paper-scissors.
"Come on!" Dean threw his hands down after once again they traitorously dealt him 'scissors' to which Sam crushed with 'rock'. As Dean tore off the jacket to his penguin suit, Jane stepped beside Sam with his hands clasped behind his back.
"He chooses that often, doesn't he?"
Sam loosened the tie to his own suit. "Every time."