The line comes from Blackadder, the British historical comedy, where Brian Blessed played the larger-than-life King Richard IV in its first series. His habit of bellowing orders at full power made the king instantly memorable, and this call for fresh horses at Chiswick became a shorthand for absurd, self-important urgency. Clips of the moment circulate among fans of British comedy and are reused in edits whenever a scene needs a voice far grander than the action on screen.