-- stepping into the world of "24" was kiefer sutherland.t is great about "grey's anatomy," there are so many cast members, every day is an opportunity to work with different types of actors, the different ways that different actors work. i feel what it would be like in the old times when there was big theaters and you would stay with the same group and do different plays. tavis: this does not happen often on the show, but every now and then we have a guest to comes to the set from their set where they were filming the show date tape and work on. you just came to us from shooting stuff today. for those of us who are "grey's anatomy" fans, tell me, without giving away the story line, what you were shooting today. >> literally, i was texting your people and said, i am still in my scruggs, stepping off the set. -- i am still in my scrubs, stepping off the set. i have to be very careful talking about. tavis: don't give anything away. >> i was doing a scene. my character, several others floating around. i discuss something a little embarrassing t