Much like the first day of elementary school, Katherine Heigl spent a decent portion of her first day back on set catching up with the cast and crew of the popular medical drama Grey's Anatomy. When it came to time to explain what she did over her vacation, an uncomfortable silence filled the parking lot. A pensive Heigl kicked at a few imaginary pebbles then explained that she's got to listen to her lines on her iPod in her car and added that she might check out that 'cake fart' website everybody is raving about as well.