Every song needs a hook and rapper KRS-One nailed it with his siren whoops. Careful or you'll be 'whooping' too.

The song, with its attack on generations of police behaviour, is part of a rap tradition which arguably began with NWA's 'Fuk tha Police' in 1989. Not that all police were offended. Apparently in 2014 two Essex policemen were caught blasting it out of their patrol car.

At the close of his sixteenth and final Dynamics student lecture, Derek Moulton gives a three-minute summary of why Dynamics is a big deal. It's a tour de 'force'.