The laughter is just as disturbing as the meltdown...
A teacher had to be escorted from school in handcuffs after smashing up furniture in front of a classroom full of jeering children. Donald Wood appeared to suffer a nervous breakdown as he struggled to control his teenage pupils at McGavock High School in Nashville, Tennessee.
Mobile phone footage recorded by one of the youngsters showed him throwing two tables, a bin and a chair during an algebra lesson.
The video starts with Mr Wood - who has been a teacher for 17 years - telling the pupils to "shut up". The classroom erupts as he is taunted by the hysterical students.
He then waves his arms and says: "If you can be absolutely quiet...if you can shut your mouth...you can shut your mouth and you can listen in absolute silence… "Do you know why? Cause I have the absolute…" "Power?" screams one of the youths.
"I've got it, and I know it," the teacher replies. "And guess who else knows it?" Mr Wood then knocks over a table, and strolls over to the other side of the room and upturns another desk.
"Do you know who started the fire? Do you know who started the fire in this school?" he asks. A student says something inaudible, and Mr Wood replies: "No - me!" He then hurls a metal bin to the floor as pupils flee in terror.
"Once everybody started running out he picked up a chair and threw it out the window and it shattered," pupil Joshua Jenkins told NewsChannel. The commotion could be heard in nearby classrooms and the teacher was removed from the school in handcuffs.
"He was very agitated, very scattered and he didn't make any sense," said the school's principal Robbin Wall. "We are very fortunate that none of our students were injured or hurt."
Mr Wood was taken to hospital for treatment, and has been suspended as investigations continue into the incident.