Another joke on a similar theme, is the moment in 'Let's Kill Hitler' shortly after a newly-regenerated River Song gets a little too close to the Doctor. And let's just say that this one's a lot easier to miss than the last one. As River rushes off to weigh herself - yes, Hitler's definitely the kind of fella to keep some scales in his office - the Doctor starts to feel extremely self conscious about the way his relationship with River is playing out. It's no surprise; he's sat next to her parents. And he puts his hands over his crotch. Watch the scene, and notice the way he does it, looking over to Rory sideways as if to hope that Rory's not looking at him too much. It really might be nothing. But if it is, it's one of the filthiest moments from any portrayal of the Doctor.
