Well the lung cancer would be a topic of mutual interest, I'm sure, though I would think Pollution had a hand in that as well... :) The only other thing I can think of off the top of my head would be the drugged wine, but I don't know how John would find out about that, as Crowley never apparently made the connection or mentioned it to him. Heh, I suppose John might be a bit of a professional affront to Pesti, Pollution and Death, since he really should have been dead some time ago and keeps finding creative ways to get out of it. He's worse than Captain Kirk. XD