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Featured Image Credit: TikTok/@brandonmonhollen
In his video, Monhollen detailed a theory he'd read about recently which he found 'seriously intriguing', saying in the caption he hoped it 'gains some traction'.
He said: "I'm not exactly sure if this is a conspiracy theory but, I read this about six months ago.
"What if when we die, the light at the end of the tunnel is the light to another hospital. There we are born, and the only reason you come out crying is because you remember everything from your past life and you're crying at the fact that you died and lost everything.
"As you grow and start to forget your past life, and you focus on the life that you have now, patches of memory stay behind and that memory causes déjà vu."
The video has since racked up more than 530,000 views and 25,000 likes in the space of a day.
While some social media users remained unconvinced by the idea or said it sounded like an episode of Black Mirror, others admitted they 'don't hate' the theory and felt it 'makes sense'.
One person commented: "Whooooooa dude!!! I think that's the most sense anyone has ever made!!!"
Someone else clearly found it pretty mind-blowing, adding: "Did you have to... omg... not going to sleep for a week."
Some also attempted to pad out the theory, with one writing: "And that's the reason why we have certain anxieties or fear of something is because of our past lives."
Another suggested: "I believe in God but maybe if u haven't been bad enough for hell or good enough for heaven so he keeps sending u back till the last judgment lol."
As for the side note about déjà vu, another TikTok user - who just so happens to be a doctor - believes there may be a simpler explanation.
In a recent video, Dr Karan Raj explained: "It's a glitch in your brain. It's when a new short term memory gets accidentally stored in the long term memory - so it feels like it's happened before, because our brain is telling us it's an old memory."
He added: "It's just sloppy admin by your brain."