Anecdotal evidence of Sean's sense of humour: so last week I went for some Flames autographs after their practice. When Sean and Lance drive out together, I get Sean's autograph and he's in full boringmonahan mode—monotone voice, just expressionless overall. Then I go get Lance's autograph and also ask for a picture, which was all great. During this I thought Sean was signing everyone else's autographs over on the other side.
Well I get home, open up the pictures on my laptop and then I see something... a face back there in the darkness. So I lighten the photo, and sure enough, there's Sean photobombing. Sticking his tongue out and everything.