It's not sarcasm. A class action lawsuit was filed in March 2013. It seems that LG screens on a certain model(s?) of a 15.6 inch Retina MacBook Pro suffer from burn in, and that there is no way for a consumer to tell whether the screen was manufactured by Samsung or LG before buying the laptop.

http://www.digitaltrends.com/computing/macbook-pro-retina-lg...