Facial Slit
Kevin Feige famously said that the entire plot of Iron Man 3 was actually the love triangle between Tony Stark, Pepper Potts, and the growing number of Iron Man suits. If the director says so, we don’t have any grounds to argue, nor would we want to dispute that claim since it was apparent in the film.
In this scene, Pepper has no idea that Tony is busy working downstairs when she comes across an empty Iron Man suit. The part where the suit suggests that Pepper give him a quick kiss in the “facial slit” is genius—disgusting, but genius nonetheless.