The video, which has had more than 7.5 million views, was shared on TikTok by Micah Wallace (@themicahwallace), leaving others baffled about how it happened.
Micah, 30, was in Barbados with his wife Sarah, 32, celebrating their honeymoon with a stay at a swanky hotel.
Micah, an office assistant from Brooklyn, New York, decided to take a dip in the pool at the Sandals Royal Barbados Resort.
It was then that the couple realised the strange - and hilarious - optical illusion, which left Sarah in stitches as she recorded.
Sarah filmed as Micah played around in the water, his heed seemingly detached from his body as it bobbed on top of the water.
The rest of his body, which was visible thanks to the see-through panels of the pool, appeared to be walking around a few feet away from Micah's head, creating a hilarious sight for Sarah.
.Micah said: "We were on our honeymoon at the Sandals Royal Barbados Resort, it was amazing.
"My wife saw my head was completely separate from my body and thought it was hilarious, so then she started filming and I started performing."
The illusion was actually created by a scientific incident known as refraction, which is the bending of light, due to the curve of the swimming pool.
After the video was viewed by millions of social media users, Micah couldn't believe the reaction it had.
He said: "When I saw it for the first time, I couldn't believe how I looked but I had no idea people were going to respond as much as they have.
"Most people are confused and the other half are people educating others about the science behind refraction."
When Micah posted the amusing video on his TikTok page, it left other users seriously confused - with some saying it had 'fried' their brains.
One person wrote: "I thought somebody was holding their breath for a really long time."
Someone else said: "I'm too drunk for this and I don't even drink."
A third pondered: "How did they do that what the hell?"
Another added: "Okay, here we go. We're having a good time now."
Featured Image Credit: Jam Press