Jack Black is hosting "Saturday Night Live" for the first time in nearly 20 years - and he kicked off tonight's episode with a song about his return as host. Black began his opening monologue by jokingly announcing that he was quitting the hosting gig.

"Thank you to Elton John, Brandi Carlile, Mike Myers," Black began, pointing to each individual as he mentioned them. When he got to Myers' name, Black went to place his arm around the man on his left — who turned out to be music producer Andrew Watt.

Jack Black rejoiced in his return to Saturday Night Live after nearly twenty years away, singing about the occasion to the tune of Aerosmith’s “Back in the Saddle.”