A man has opened up about the idiotic life decision a colleague made to prove a point.
The naval officer took to Reddit to explain how a bloke he was working with told him he joined the Navy to get onto the open seas and finally get proof that the earth was flat.
While there are plenty of flat earthers out there who wholeheartedly believe the planet is on a large, round disc surrounded by massive ice walls to keep everything in, no one has been able to give evidence that this exists.
But this naval officer was hopeful their vessel would take them to the literal corners of the earth and he would finally get the proof he needed.
TrungusMcTungus wrote on social media: "Every day he would chart the ships location, speed, heading, etc, a few times a day so he could make a map of their path.
"Ultimately he realized that the path the ship was taking would be impossible if the Earth was flat, based on the distance they were traveling vs their speed."
The penny eventually dropped when he was trying to monitor where the ship was going one ay.
The Petty Officer 'pointed out the curvature by giving [the flat earther] binoculars and explained that if the Earth was flat, he should be able to see the land they were making for'.
"He couldn't see anything off the horizon. After that, he was convinced," the Redditor wrote.
Imagine joining the Navy and having to go through all the trials and tests to get onto the sea with the sole purpose of finding one thing, only to discover it was all a lie.
But it's not as simple as saying farewell to the Navy whenever you want. There is a four-year minimum service time attached to the American Navy, however other positions could require longer commitment.
We guess that would give our flat earther plenty of time to think about their decisions.
People responding to TrungusMcTungus explained how they too gave up their flat earth obsessions when they did tests with the horizon.
One user said: "I saw a video of an experiment where one group flew a helicopter far out over the ocean and another group watched it with a powerful telescope as it slowly lowered to the horizon.
"It disappeared behind the horizon while the helicopter was still a considerable distance from the ground. That ended that phase for me for good."
You'd be better off starting with tests like this rather than signing yourself up to a four-year naval commitment.