These New Yorkers got on the subway expecting their boring ol' commute. Instead, their ride was anything but mundane.

During a break between shows, the Broadway cast of "The Lion King" decided to surprise their unsuspecting fellow straphangers with an a cappella performance in late June. About 30 cast members boarded an A train and broke into song.

Watch the 0:22 mark of the video above, as a woman who'd been reading a book suddenly bursts into the iconic opening lines of "The Circle of Life." Then several other commuters who initially appeared to be normal passengers join the joyful singalong.

Last year, "The Lion King" became Broadway's first $1 billion show. To commemorate the milestone, cast members decided to honor the New York City subway, which served more than 1 billion commuters last year.

This subway performance wasn't the first time a "Lion King" cast surprised commuters on public transportation. Back in April, the Brisbane cast of "The Lion King" delighted Virgin Australia Airlines passengers by hitting their "Circle of Life" high notes up in the air.