In its purest form, prod rock aimed to make the listener feel as if they were being sharply and repeatedly poked with a blunt instrument. This sensation must not be confused with that known as 'Blunt's Instrument' , whereby the listener feels like their ears are being violated by a posh man's wang, brought about by listening to James Blunt. Later, it began to induce other feelings of agony. The acts that defined prod rock's 1970's heyday included: Angry Giant, Van with Drill Generator,Crush, Fling Plimsole, Imprison, Gag & Spammer, Jethro's Pull, NO! and Puke Floyd.