Marie spots the minor flaw in Rosby's genius plot to garner comments

Marie is clearly so much smarter than me. So bowled over was I by the hilarious imaginings of la Rosby that I completely missed the key point. It took Marie to point out the obvious flaw:

In order to get me to comment, you threaten me with the suggestion that if I *don't*, you will steal David Tennant and get him to smile at me. And this is supposed to make me comment?

Damn.

Clearly even mention of the smile is enough to cause delirium and idiocy in me...