Teaching high school math for 17 years finally caught up with Donald Wood. Yesterday, the Tennessee teacher lost his mind during class and started throwing chairs and desks across the room. Wood was cuffed and removed from school grounds.

The incident at McGavock High School was recorded by a student using a cell phone. At first it seems like a joke, but then he starts throwing things, yelling and the guy basically loses his mind. Wood tells everyone to shut up, goes on a rant about his "absolute power," and claims he started a fire in the school. It's pretty sad. According to local News Channel 5:

Witnesses said Wood shouted profanities and resource officers and students in the hall as he was escorted out. School officials said Wood suffered from an apparent nervous breakdown.

The quality is terrible, but here's the cell phone video shot by a student: