SNL Jennifer Lawrence Woody Harrelson hosted "Saturday Night Live" on Nov. 15 and surprised audiences with his "The Hunger Games" cast mates. Left to right: Liam Hemsworth, Josh Hutcherson, Harrelson, Jennifer Lawrence. Photo: NBC/Dana Edelson

Woody Harrelson hosted “Saturday Night Live” on Nov. 16, and his cast mates from “The Hunger Games: Mockingjay, Part 1” surprised the audience by showing up during his opening monologue. Liam Hemsworth and Josh Hutcherson came out first and were quickly followed by Jennifer Lawrence.

Harrelson’s monologue was a parody of Taylor Swift’s album “1989,” named for the year she was born. He picked up a guitar and started singing about the things that actually happened during 1989 to the tune of her single “Blank Space.”

“With all due respect to Miss Swift, I think I know a little more about 1989 than she does,” Harrelson said. “Even if the memories are a little fuzzy ‘cause of the drugs.”

Michael Keaton was Batman, the Berlin Wall came down, he was on “Cheers,” but after that Harrelson had a “blank space” because, he said, he used to do cocaine. That was when Hemsworth, 24, and Hutcherson, 22, interrupted the "SNL" host. They couldn’t help him sing because they weren’t even born in 1989, but they knew what Harrelson told them.

“The Berlin Wall was torn down by the Kool-Aid man,” Hutcherson said.

“Einstein invented Wi-Fi,” Hemsworth said.

Then Lawrence finally joined them on the "SNL" stage. Harrelson thought she was Swift at first, and then thought she was his other “Hunger Games” co-star Elizabeth Banks. After she gave up trying to get him to remember her, Lawrence tried to give Harrelson some advice before he sang again.

“Just keep it vague. It’s like you always say,” Lawrence said. However, audiences don’t know what Harrelson always says because Lawrence stuttered and fumbled over the impression before dissolving into laughter.

“It’s because you’re always so stoned!” she explained, which made her cast mates break into laughter as well. They quickly recovered and joined in on Harrelson’s version of “1989.”

Watch the clip below:

"The Hunger Games: Mockingjay, Part 1" will be in theaters nationwide on Nov. 21.