The four sneak previews we posted yesterday for "Sympathy For the Parents" focused largely on Alex's brother, who appears for the first time on Grey's Anatomy this week.

Here's one additional, light clip we came across from the episode, featuring Mark, Callie and Arizona. Any interaction between them is usually gold, and this is no exception.

Is pound cake actually code for something else? Or does Mark just have the mind of a 15-year-old? Either way, it's a funny exchange he and Callie have in the clip below ...

[video url="http://www.tvfanatic.com/videos/sympathy-for-the-parents-sneak-preview-5/" title="Sympathy For the Parents Sneak Preview #5"] [/video]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.