Yesteryear! Excuse me.
That video shows Trafalgar Square in London, as it was. Today you can't circle Nelson's Column, the road in front of The British Museum has been pedestrianized. Back in those days, we had great fun driving around Trafalgar Square. If you entered it from the, St Martin's Church end, you would be going downhill. Knock your gear into neutral, switch the engine off, (no steering locks to worry about back then,) pump the gas pedal hard, twice. Switch the engine back on. The unburnt fuel that is now in your exhaust pipe ignites, creating the most enormous backfire, sending Trafalgar Square's pigeons skywards and leaving the tourists covered in feathers and poop.
Enraged tourists sometimes got the last laugh though, the backfire could, and sometimes did, rip your exhaust off.