Trigonometry may never be funnier.
Watch Biola University math professor Matthew Weathers give a lesson using a video of himself doing a problem incorrectly. And when the Weathers in the video begins to talk smack to the real Weathers, the back-and-forth escalates into one creative fight.
"I played a trick on my math class for April Fool's Day," Weathers wrote on YouTube. "In this one, I'm showing a 'homework help' video that gets some trigonometry wrong. How embarrassing!"
Weathers is known for his interactive presentations, having tussled with his video self before. School publication The Chimes described him in a 2010 article as "a professor that brightens your day during class by bringing color to an often not-too-interesting subject."