Jerry Seinfeld's Comedians in Cars interview he was 'most nervous' for - USA TODAY

Jerry Seinfeld sips from one of Starbucks’ recognizable holiday cups at the start of an interview about his new book “The Comedians in Cars Getting Coffee Book” (Simon & Schuster, 352 pp., out now) commemorating the decade since his series first percolated on Crackle.

His beverage is an interesting choice considering the standup personally pitched "Comedians in Cars" back when it was a bean of an idea to Howard Schultz, then-CEO of Starbucks and got denied.

'Each has some insane thing in it': Jerry Seinfeld on what makes a classic 'Seinfeld' episode.

The "Comedians in Cars" host was “most nervous” for his chat with then-sitting President Barack Obama for Season 7.

Seinfeld says Obama surprised him in every way: “That he wanted to do it, that he was comfortable doing it, that he enjoyed doing it. There's not too many cool presidents… I don't think I could have a conversation with most presidents or would even want to.” .

But with “Comedians in Cars,” Seinfeld says the project was so personal, he wasn't sure how it would be received. "There's this other side of my life that was about just hanging out with these crazy people and was just as great for me as the career part.” 

Outside of Rickles' condo, "his leg was bothering him and he was trying to shake the leg out, and he just looked at me and he says, 'I gotta keep working,'" Seinfeld recalls. "I don't know why, but I think about that a lot. I think about this thing of just working till death

Is that the right or the wrong thing to do? Is that a good light to follow in life just work till you're dead? I've decided it is.”