"I had coronary artery disease, you just blew out a valve," Letterman said, to which Walters countered, "I have a pig valve, you don't have a pig valve."
"No, but I have other pig parts on me," he replied.
They also discussed the symptoms they felt leading up to their operations…well, one of them did, anyway.
"Looking back on it, I don't know if I had specific heart-related symptoms, but I knew for a couple of years before the surgery, I thought country music was getting worse," Letterman joked. "But I don't know if that's a symptom exactly."
They also discussed the importance of getting an angiogram, which Letterman explained thusly: "They take a thing and run it up your deal…Fantastic."
Of course, this being Letterman, the gals—who other than Walters and Joy Behar remained mostly quiet so as not to interrupt the intimidating love fest—asked about the Jay Leno-Conan O'Brien brouhaha.
Letterman took his usual stance of breaking out the Leno impression and noting that "it was fun to see Jay squirm," but also said that he would be among the Team CoCo fans tuning in when Conan debuts on TBS this fall.
"I will watch it, I've always liked Conan."
Not so Jon Stewart, at least not until he stops beating the Late Show at the Emmys. When asked if the Daily Show's domination bugged him, Letterman jokingly replied, "Yes, it does."
"I'd like to kill the little bastard."
As for the real reason why he was there, to commiserate on heart surgeries, Letterman said that the operation was not nearly as debilitating as some people may think.
"It's not so much what you're not gonna do anymore, it's what you can do now," he said. "It was looking forward more than it was looking backward."
And what Letterman is looking forward to now is the possibility—should the ever-forgiving Mrs. Letterman agree—to more kids.
"I feel in every important way, your life doesn't really begin until you've had kids. I would like to have more kids."