Annoying Orange: Easy as Pi

Easy as Pi is the 45th episode of Season 7 and the 214th episode of the whole series.

Plot
Professor Pie teaches his math class fractions. Orange then keeps on saying knife, and each time a new fraction of him is cut off. The rest of the class don't laugh at the knife attacks, thy laugh when his voice gets weirder and when he hits the wall.

Fruity Question of the Day
What's your least favorite class in school?

Leave your answer in the comments!