On Sunday, Discovery Channel aired its 'Shark Week' special, which featured Michael Phelps racing against a great white shark. Or did it? Users watched as Phelps swam alone, time-trial style, with a computer-generated image of a great white shark. The CGI shark was supposed to match the speed of a real shark, which can swim up to 25 mph. Viewers took to social media to rant about their disappointment:
