The one that sticks out in my mind is the one with the guy that bought a motorcycle helmet with fake safety certifications off Amazon and got in a serious accident. I can't find any articles about it, but, IIRC, the lawsuit was decided in favor of Amazon, so maybe it's been scrubbed from the internet.

Fake, unsafe stuff is rampant:

1. (Paywall) https://www.wsj.com/articles/amazon-has-ceded-control-of-its...

2. https://www.npr.org/2018/09/16/647377213/fake-bike-helmets-c...

3. https://www.cnn.com/2019/12/20/tech/amazon-fake-kids-product...