Andy Cohen was surprised by John Mayer at the taping of a special episode of Watch What Happens Live with Andy Cohen in honor of the host's 50th birthday, and the singer peppered Andy with viewer questions. One asked who Andy's ideal dinner party guest list would be, dead or alive.

Andy didn't initially understand the scope of the question, so he started naming living people: "Mayer, Michelle Obama — oh, dead or alive? Let's go dead! Let's add Jackie O, Lucy [Ball], Abe Lincoln, Jesus — we gotta go way back, right?"

"I just love watching an uncomfortable Abe Lincoln poking at his steak," John joked. "Everyone else is just commiserating and getting along and he's the odd man out."

"And Lucy's smoking!" Andy retorted.

Earlier, John told a shocked Andy that keeping the birthday surprise from him was not easy.

"It is so hard to go dark on Andy because we talk so constantly, I couldn't give away that I was in New York," he said. "It was the hardest 12 hours of my life."