Former hosts Chris Rock, Billy Crystal, Seth MacFarlane, Hugh Jackman, Steve Martin, Neil Patrick Harris, Ellen DeGeneres, Whoopi Goldberg, Chevy Chase, David Letterman, Johnny Carson and Bob Hope have left big shoes for Kimmel to fill.
"What I would've loved is if the last 14 Oscar hosts had bombed miserably," Kimmel joked. "That's my dream -- get in a time machine and go back and ruin the Oscars for all those hosts."
It also doesn't help Kimmel that his longtime frenemy, Matt Damon, will be in the audience wishing him "horrible things," as the Oscar-winning actor told ET last week.
"I'm just sad Chris Rock isn't hosting the show, someone who's actually funny," Damon quipped. "It's a testament to the brilliance of his writing staff that he still has a job."
"This is Meryl Streep's 20th nomination. I thought it would be funny to give her a pony," Kimmel said. "At first [McNearney] thought, 'I could probably hold a pony on leash for three hours,' but she came to her senses and thought that was not a great idea."
McNearney, who is pregnant with the couple's second child, will be helping with Kimmel's jokes from backstage when the 89th Academy Awards broadcast airs live Sunday at 5:30 p.m. PT/ 8:30 p.m. PT on ABC.