In a devastating reminder to all those guys who think of life-threatening situations and reckon they'd probably be OK, not even history's most-decorated swimmer could outpace a shark.
2017 was a simpler time where people loved to wonder who would win in a battle between man and shark in the shark's natural habitat.
So of course the solution was to put Michael Phelps, who has 28 Olympic medals, into the water for a race against a great white shark.
Could the world's most successful swimmer stay ahead of the jaws of a great white shark that was playing on home turf?
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Absolutely f**king not, obviously.
If you think you could out-swim a shark you seriously need to have a look at yourself.
Discovery put the race on, with Phelps donning a wetsuit with a fin in an attempt to even the odds a little bit in the 100 metre race.
The swimmer's all-time record to swim 100 metres was 47.51 seconds, but with the special wetsuit and fin on he posted a very respectable time of 38.1 seconds.
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Some people watching the show thought that Phelps might have been in serious danger of being gobbled up by the shark, which posted a time of 36.1 seconds.
"Man I'm stupid," one viewer declared as they commented that they actually thought that Phelps was going to be racing a great white shark, when actually it was just a computer recreation of one.
Others 'thought the CGI shark ate Phelps for a second', while plenty couldn't believe how folks had actually managed to be duped.
"Come on people, you can't put a human and a shark side by side in the ocean, otherwise the shark would eat Michael," they said.
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Of course the shark was simulated and still handily beat Phelps, while many more pointed out that this race was only ever going to go one way since a shark could go much faster than a human.
A great white shark can reach speeds of up to 56km/h, while the Olympic swimmer can only really get to 7.6km/h.
On the other hand, sharks rarely swim in a straight line and would prefer to zig-zag.
If you actually tried to race a human and a shark then the shark would almost certainly win if it locked in and tried its best.
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Fortunately for Phelps and all the people duped by a CGI shark, he was never in any real danger.
Joe Harker