Here's a professor who got an awesome end-of-semester surprise from his students. It was during an online class and he noticed their cameras were turned off. He joked about it, and even thought it was his fault . . . but it wasn't.
Finally, one student told everyone to turn their cameras on, and you see them all holding homemade signs of appreciation. Stuff like, "Thanks for a great semester." "Thank you for making a difference every day." "We appreciate you Dr. Brown."