AUGH JESUS. Or, y'know, not Jesus, considering who Ruby is, but the idea behind it remains the same. Dean jumps about six feet in the air and then turns to look at Ruby with a slightly panicked expression.

The moment he realizes it's her, his expression shifts, and he's trying to at least look like he's irritated instead of listening to his heart pound in his ears.

"Not exactly. Only undead thing I've seen so far is a vampire I'm not allowed to kill." Grumble grumble.