Belt Up Kiddies, I'll Do the Funnies

Mr. Rankin stood before his Maths class, textbook in hand. He sighed, and scratched at his head. Why did he bother teaching anything when these little bastards paid little or no attention? Or like today - dicking about, sat at their desks and staring straight ahead, perfectly silent.

Then the humming. Christ, the humming. Emanating from each one of them, steadily growing in volume, until they all stood up, vocalising in harmony.

'Alright...belt up kiddies, I'll do the funnies!' Mr. Rankin warned.

As one, the children of Class 8B advanced on the teacher, dragging him down to the classroom floor, screaming.