Whitehall - one January 1st, I was watching the New Year Parade at Horseguards.
Excitable Italian tourist climbs up the railing to get a better view.
Lifeguard, seeing this, walks his horse forward round to the railing, right up to the tourist.
"Please get down off there now sir!"
Italian makes a hasty descent and Lifeguard reverses his horse back into position.
Crowd well impressed, and I was just so proud to be British!
(Re the vid, drill looks fine to me, but that is a bloody awful greatcoat though!)