When asked a few questions about Beyonce, Bush had no idea that the singer was married to Jay Z or that she was pregnant with twins.
He did, however, love Kimmel's monologue at the 89th Academy Awards, and was aware of the major flub at the end of the awards show, when La La Land was announced as Best Picture when Moonlight actually won. "I felt sorry for you," Bush told Kimmel. "You were like, 'PricewaterhouseCoopers did it!'"
The men also chatted about all the impersonations of Bush during his presidency, and in particular, what he thought of Will Ferrell mimicking him.
"You wanna hear something terrible. So, I had dinner with Lorne Michaels, the head of Saturday Night Live, and he said, 'I put a great speech writer on you and he came up with stategery,'" Bush recalled. "And I said, 'Wait a minute, I said stategery.' And he said, 'No, you didn't say stategery.' I said, 'I damn sure says stratergery!' He said, 'We invented it.'"
The 43rd president quipped, "I said, 'Well, let me ask you this, did he come up with mis-underestimate?'"
As for whether the impersonations ever bothered him, Bush said, "Not at all."
"I love humor," he continued, sharing that his favorite impersonation of himself was from the late Steve Bridges. "The best humor is when you can make fun of yourself."
Bush is currently promoting his book, Portraits of Courage, with proceeds going to the George W. Bush Presidential Center, a non-profit that helps post-9/11 veterans transitions to civilian life.
A day prior to the former commander in chief's appearance on JKL, Alec Baldwin appeared on the late-night show and admitted that he's "lobbying" to impersonate President Donald Trump at the White House Correspondents' Dinner.