So I don't own anything from Supernatural obviously. I thought about this story idea last night and hopefully you get the same kick out of it that I did. Enjoy!
Dean looked around frantically, but Sam had somehow vanished. The hallway was growing dimmer and colder. Dean knew he was running out of time. He decided he could come back for Sam once this was all over. Dean quickened his pace down the corridor, shotgun ready in his left hand. The scratching that he and Sam had heard earlier started up again and was rapidly growing louder as Dean neared the door that appeared to be the source of the noise. He cocked the gun, prepared for whatever Hell lay beyond the door. Dean kicked it open with all his might and jumped back in fright at the dark figure that leaped out at him. Dean woke up tightly clutching the sheets in his fists, sweat running down his face. Sam turned to his brother, a look of concern displayed, "Dean what is it?" Dean looked back at his younger sibling wearing a fear stricken expression.
"Damn cat." he muttered.