david letterman regis kelly David Letterman on 'Regis and Kelly': Jay Leno is a 'knockwurst'David Letterman made a rare foray outside the Ed Sullivan Theater on Friday (April 30) to visit his buddy Regis Philbin on “Live with Regis and Kelly.” And — surprise — he got in a few digs at his late-night rival Jay Leno.

“I just loved it,” he said of the Leno-Conan O’Brien-NBC mess that went down earlier this year. “We all got to see Jay — I’ve known Jay since 1975 or so. When we were all in California trying to become comedians, he was without question the funny guy. He was the guy. … But then there’s also a side of Jay where he’s just a little — I don’t know — he’s a bit of a knockwurst. You know what that means?”

Seeing the confused looks on Philbin’s and Kelly Ripa’s faces, Letterman added, “I’m not sure I do either.” (Nor, frankly, do we. We do like knockwurst, though, so thanks for making us hungry, Dave.)

Letterman also shared his thoughts on Leno’s oft-quoted “we both got screwed” comment and recounted the filming of their Super Bowl promo with Oprah Winfrey. Take a look (the Leno material starts about eight minutes in):

Also, “Live” posted a behind-the-scenes clip with both Letterman and Ripa giving Philbin the business during a commercial break.

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Related:

Jimmy Kimmel, David Letterman jab at Jay Leno
Jay Leno to Joy Behar: Conan got screwed, I got screwed
Conan O’Brien on ’60 Minutes’: NBC relationship turned ‘toxic’

Photo credit: “Live with Regis and Kelly”