In 1894, Queen Victoria of England decided to pay a visit the London Horse Guards in her carriage. She was not amused to arrive and find guards drinking and gambling while they were supposed to be on duty. She ordered that, as punishment, the guards had to parade for inspection by an officer every day at 4 o’clock – for 100 years!
The punishment ended in 1994 but Queen Elizabeth II wanted the parade to continue. So the Household Cavalry still parade every day at 4 o’clock.