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In a story that has been likened to the film Groundhog Day, a girl lives through every single day with no recollection of the one before it.
Sounds great as a premise for a film - in real life, though, it's much less entertaining. One girl from Illinois is trapped in a never-ending loop. Her memory resets every two hours, making it difficult for her to remember even her friends and family.
The teenager has suffered a traumatic brain injury, which means every time her memory resets, she forgets everything and thinks it's 11 June.
On 11 June, 16-year-old Riley Horner was involved in an accident where she was kicked in the head during a dance class.
Speaking to news station WQAD, she said: "I have a calendar on my door and I look and it's September and I'm like, 'Whoa!'
"People don't understand - it's like a movie."
Although she's been to various hospitals dozens of times, medical professionals are still none the wiser as to what has happened to her.
Riley added: "I'm not making memories and I'm just really scared. I will have no recollection of this [interview] come supper time. My mum will say, 'Oh, you were on the news.'"
Her family says they have visited any local hospital they can near their hometown of Monmouth - but to no avail.
Riley's mum, Sarah Horn told the station: "They tell us there's nothing medically wrong.
"They can't see anything. You can't see a concussion, though, on an MRI or a CT scan. There's no brain bleed, there's no tumour."
Riley now has to repeatedly write things in a notebook that she carries around with her just to function. She also has to take constant photos on her phone so she can remember basic information. Even finding her locker at school poses a huge issue.
Sadly, the unknown condition even causes her to forget major family events.
Her mother continued: "My brother passed away last week and she probably has no idea. We tell her every day but she has no idea about it."
Although doctors don't know what the condition is, they have warned the family it could be permanent. Her mother has appealed for someone to give the family some answers.
Sarah said: "I am not okay with that. We need help. We need somebody that knows a little bit more because she deserves better."
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