A woman is being investigated by police after she rode into a supermarket on horseback to take part in a craze that is sweeping the internet.
Inky Ralph, 21, was filmed riding into a Tesco store in Bishop Auckland, County Durham, and downing a Pepsi Max as part of a Neknomination challenge.
As she enters the shop on her horse Harvey, she is confronted by a security guard and an announcement can then be heard calling for the duty manager.
Miss Ralph turns to the camera and nominates friends of hers to complete their own challenge, as well as the security guard.
The craze, which has taken off on social media sites, involves people completing dares and ending by downing a drink.
She told the Northern Echo newspaper: "It was something nobody else had done. It was just harmless fun. Everybody seems to find it really funny.
"I didn't realise how far it would spread and how many people would see it. I have had messages from as far as Australia and people are calling me a legend."
But the police have said they will be arranging for those involved to attend their local station and are trying to establish what offences might have been committed.
Chief Inspector Sue Robinson, of Durham Constabulary, said: "On Monday afternoon police were called by staff at the Tesco store in St Helen Auckland reporting a number of young women had been in the premises, with one of them riding a horse. They allegedly threatened a member of staff before leaving a few minutes later.
"Officers have viewed the in-store security footage as well as the video clip which has been circulating on social media. Those involved are believed to be well-known to both staff at the store and to ourselves and we will be arranging for them to attend their local police station at the earliest opportunity.
"At this stage we are trying to establish what criminal offences might have been committed and discussions have taken place with the RSPCA in regards to the welfare of the horse.
"It goes without saying this was a senseless and foolish thing to do. There were a number of shoppers in the store at the time and it is fortunate no one was hurt."
A spokesman for Tesco said: "We are aware of the incident and the police are investigating."