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Jimmy Fallon surprised graduates of Marjory Stoneman Douglas High School on Sunday, with a commencement speech to remember.

The Tonight Showhost took the stage at the graduation ceremony at the BB&T Center in Sunrise, Florida on Sunday as a guest speaker, delivering a keynote for the class of 2018.

SEE ALSO:'Black Panther' star Chadwick Boseman inspires students to challenge discrimination

Among Fallon's characteristic comedic banter were messages of heartfelt admiration for the students, who led the charge on March for Our Lives following February's tragic school shooting which saw 17 people killed. Graduates at the ceremony wore sashes that read "MSD Strong."

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"Today you're graduating from high school," said Fallon. "You should feel incredibly proud of yourselves. That doesn't mean you should rest on your laurels — or your yannys.

"Some of you will grow up to hear yanny, some of you will grow up to hear laurel, but the most important thing to know is that neither of these things will matter by the end of the summer.

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"Here's what will matter: you, the class of 2018, will have graduated. And you won't be classmates anymore. You'll be adults who Facebook search each other at two in the morning for the next ten years."

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Fallon has been actively supportive of the Marjory Stoneman Douglas students since February's shooting, attending the March For Our Lives on March 24 in Washington, DC.

"When something feels hard, remember that it gets better," said Fallon. "Choose to move forward, and don't let anything stop you."

Here's the whole speech. It's just 10 minutes and worth your time:

In a particularly emotional moment during the ceremony, Marjory Stoneman Douglas awarded posthumous degrees to the four seniors, Nicholas Dworet, Joaquin Oliver, Carmen Schentrup, and Meadow Pollack, who were killed in February's shooting. As reported by WPLG Local 10 News, the diplomas were accepted by their family and friends.

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TopicsActivismThe Tonight Show Starring Jimmy FallonCelebrities