The Simpsons' Hank Azaria has shared a clip of him attempting to make a member of the King's Guard laugh by impersonating famous characters from the show.
The well known voice actor posted a TikTok video of himself attempting to break the iron will of the young guard at the Tower of London.
Addressing the camera, Azaria jokes: 'We'll see if the guard is a Simpsons fan at all.'
Turning to the guard, dressed in the classic scarlet tunic and bearskin cap, Azaria starts with Moe Szyslak - Springfield's own grouchy bartender.
In Moe's infamous gravelly voice, Azaria said: 'I just wanted to thank you for your service here.'
Hank Azaria (left), voice of a handful of Simpsons characters, attempts to make a King's Guard laugh at the Tower of London
The American actor does not stop at one impression, however, changing his voice to that of Chief Clancy Wiggum.
Ad-libbing as the notoriously lazy police officer, Azaria said: 'I know what it's like to, you know, do your duty.'
Still, the guard does not break.
Azaria switches to the voice of Snake Jailbird - the cartoon criminal who just can't seem to stay out of jail - and Professor Frink, who temporarily became the richest man in Springfield after creating Frinkcoin crytocurrency.
When all of his voices fail to make the guard laugh, or even smirk, Azaria finishes his one-sided conversation in the voice of Jeff Albertson, more commonly known as Comic Book Guy.
The voice actor announces that the unfazed man in front of him is the 'best guard ever'.
'He seems impenetrable,' the voice actor says to the camera.
The hilarious encounter was a far cry from the usual run-ins the King's Guards have with members of the public.
Despite a sign clearly stating that horses may kick and bite, tourists continue to pose alongside them, often at their peril.
Azaria voices Springfield's grouchy bartender Moe Szyslak (left) and Chief Clancy Wiggum (right) - the notoriously lazy police officer
Last month a tourist hurtled to the pavement outside Buckingham Palace after she was seemingly headbutted by a King's Guard horse - although not everyone watching was convinced.
The video showed a curly-haired woman standing and smiling next to a black horse as she posed for photos before the horse nudged her.
The woman then dramatically fell to the pavement, landing face down as her bag flew out away from her and a gathered crowd let out a concerned 'ooh'.
In May, a King's Guard horse bit a tourist after she touched the animal while posing for a photo.
Video footage, which went viral on social media with over 855,000 views, shows the woman putting her hand on the horse's neck while posing for a photograph.
The horse then swung its head towards the woman before clamping down on her saree.
In January of this year, a female tourist posed for a photo opportunity with the King's Guard horse when it bit down on the arm of her black puffer jacket and aggressively tugged her around.
Last month a horse gently nudged the woman who was seemingly so shocked she fell to the ground
The woman was thrown on to the pavement and landed face down as her handbag flew out from under her. Worried onlookers rushed to her aid and helped her back on her feet
In one incident, when a woman went to stroke the horse's face, it bit down on the arm of her jacket. Refusing to let go, it tugged on the jacket and pulled her back and forth and up and down before finally releasing it
In another video a man was seeing touching the reins of one of the horses
This caused the King's Guard to bellow: 'Do not touch the reins!'
Despite many considering them tourist attractions, the King's Guard consist of elite serving soldiers who are tasked with protecting the monarch's life and properties.
The King's Guard are generally not allowed to interact with the public, but may shout if they get too close or present their bayonets if they become aggressive.
The soldiers must not let anything distract them from their duties - with toilet breaks banned during two hour shifts - and will march through anyone in their way.
