Guardsmen are often renowned for remaining stoic while tourists torment them, but one Scotsman had enough.
A video posted to YouTube shows the guard, on the left, losing his cool at a man getting into the groove in front of St James's Palace in London where Prince Charles is based.
The tourist's singing is muffled by the sounds of passing traffic, but the incredibly annoyed guard raised his voice enough to be heard yelling "Halt! Get yourself away!" in a thick Scottish accent.
A stomping foot from the angry guardsman is the last dance move of the day, and the tourist wanders off with his tail between his legs.