I need t' tell ya abou' somethin' dangerous in the 'ouse. You're the experts, you an' your brother. I'm sure you've dealt with the sort before, but once I tell ya, I gotta ask ya t' leave it alone.
[He's very quiet for a long moment, thinking back to the last few times he ran into a vampire. To be honest, it's a good thing he knows before Dean. He's way more likely to let the thing live.]
[He knows it's ironic all things considered, but he doesn't like the idea of a vampire running around unchecked. Or Rose running around with said vampire.]