https://phys.org/news/2018-07-amazon-prime-day-doesnt-dogs.html

Shoppers clicking on many Prime Day links after the 3 p.m. ET launch in the U.S. got only images of dogs—some quite abashed-looking—with the words, "Uh-oh. Something went wrong on our end." People took to social media to complain that they couldn't order items.

By about 4:30 p.m., many Prime Day links were working, and Amazon said later Monday that it was working to resolve the glitches.