This article originally appeared on ThisIsInsider.com.
Do not mess with the Queen's Guard.
One tourist learned this lesson the hard way as she was shoved by a guardsman while visiting Windsor Castle, one of the Queen's official residences where she can often be found at weekends.
The footage, shared on LiveLeak, shows a woman standing beyond a rope barrier with her back to an approaching member of the Queen's Guard.
The guard then pushes the woman forward, causing her to scream.
It's not clear when the incident took place. A spokesman for the Ministry of Defence told The Sun: "The Household Division is proud to guard Her Majesty and honoured that people come from around the world to watch our ceremonial spectacle. "The ropes are there to protect both the public and our soldiers; please stay behind them."
This is not the first time a member of the Queen's Guard has berated a tourist.
Last year, a tourist attempted to get a reaction from a member of the Queen's Guard by throwing a glove at him. The guardsman didn't flinch but a Beefeater scolded the culprit for attempting to distract the guard.
Earlier that year, a man was screamed at for dancing in front of the Queen's Guard.
A member of the Queen's Guard took part in a Reddit AMA (Ask Me Anything) in 2014, and said that the guards were authorised to move members of the public that crossed them.
"You are allowed to get them away by shouting warnings at them. If they fail to move away or start to act aggressively we present our bayonets... to remind them that we can do more harm than them. But usually the police are quick and remove trouble makers," he wrote.
"People should not go and try to provoke the guards. It's just not respectful."