Just as many people are doing their back-to-school shopping, Amazon.com's website crashed for the better part of an hour Monday. The downed site was first noted at 2:48 p.m. ET Monday on Twitter. It was online around 3:35 p.m. Amazon.com showed a sense of humor while its site and mobile apps were down briefly Monday afternoon. The website showed this page, including covers of children's books titled "I'm Sorry My Bad," "Oops!" and the video "Grave Mistake."