Viewers were left disappointed for more reason than one when 28-time Olympic medallist Michael Phelps raced - and out lost to - a shark overnight.
Not only did Phelps get beat by two seconds in the 100m race, viewers also accused him of not racing a shark at all, as it emerged that the Olympian's opponent was a simulated CGI great white and not a real one.
Check out how people reacted overnight on social media: Social Reaction