There was one scene where I’m wearing the cast. I have a newspaper on my lap. Somebody comes in my office, and I put the newspaper down [to cover the cast], and I’m like, “What? What do you want?” So we shot that. Then I went to the doctor and they cut it off and put a removable cast on. But then the scene where I promote Elisabeth Moss [playing Peggy Olson] to copywriter, we rehearse it, and I say, “Lizzie, I broke my hand. I don’t have the cast on it now, obviously, because I’m shooting this. So please—I’ll shake your hand, but don’t shake. You know, fake it a little bit.” So we shoot—we do a rehearsal, and Pete says, “Well, we don’t have any copywriters.” I say, “Well, hold on. Peggy, come in here. You’re now promoted to junior copywriter. Your first thing is going to be working with Pete.” And she’s like, “Oh, my gosh. Thank you so much.” And I say, “You’re welcome.” And she… [Hamm pantomimes an extraordinarily firm handshake.] It was just like lightning bolts of pain, like I was almost driven to my knees. And she let go, and she was like, “Oh, my God! What did I do? What did I do?” I was like, “I told you not to shake my hand.” She was like, “I thought you were kidding.” [Laughs.] Like what kind of joke would that be? Like, oh, it was going to be hilarious, a fake handshake. But I’ve since avoided any other injuries, so God bless. (Jon Hamm)