NFL legend Peyton Manning surprised a bunch of Communications 499 students at the University of Tennessee by crashing his former professor's online class.

Manning is one of Tennessee's most famous alums. The NFL legend dropped by to give some sound advice to the seniors who are spending their final year in college under extraordinary circumstances.

Since March 23, Tennessee has moved all of its classes online for the rest of the semester. For Manning, the students should not only keep working hard, but they should also take the time to help others in need.

“I realize this is probably not the ideal way you guys expected to spend your senior year,” Manning said, as transcribed by Ben Pickman of Sports Illustrated. “I just encourage you to keep a positive attitude. Keep working like you're doing and try to take a little bit of the extra time you have to accomplish something else or help out somebody in need. There are a lot of people hurting out there during this time.

“Be thankful for what you have. And just know the University of Tennessee is proud of you and going to support you every way they can. And Dr. Haas and his department are going to do the same thing.”

As seen in the clip below, some students were struck by Manning's appearance and sneakily took out their phones to take a picture of the legendary quarterback.

During his stint in Tennessee, Manning led the Volunteers to the 1997 SEC championship. He passed for 11,201 yards and 89 touchdowns during his college career. In 2005, the school retired his No. 16 jersey.