Jimmy Fallon surprised Parkland high school grads by speaking at their commencement ceremony

Marjory Stoneman Douglas High School's class of 2018 got a surprise visit from late night talk show host Jimmy Fallon on Sunday. He took the stage at their graduation ceremony to deliver a humorous and heartfelt commencement speech.

When you think of commencement speakers, you think of people who are inspirational, people who are eloquent, people who've changed the world. When you think of high school students, you think of people who are immature, slightly awkward, still learning to be an adult.

Welcome to "Opposite Day."

The Parkland, Florida students were the survivors of the shooting that happened nearly four months ago on their campus. Seventeen of their classmates and school staff died in the tragedy on February 14, 2018.

Fallon said he and his wife and two young girls to the ceremony because "we wanted them to see what hope and light looks like."

Watch his full speech in the video above.https://twitter.com/jimmyfallon/status/1003371562194653184