Seth Rogen was a guest on "Watch What Happens Live" Wednesday, March 12, and Andy Cohen put him on the spot, asking him to "out" his stoner friends.

Cohen quizzed Rogen with a list of celebrities the actor has worked with, has been associated with or are just plain known for smoking (read: Snoop Lion). Paul Rudd, for instance, has smoked with him many times, but you'll be very surprised who hasn't ...