Everyone hates "that guy" that never turns off their cell phone and distracts everyone around them. It happens at the movie theater, in a meeting, or any other event where silence is preferred. Some people just don't seem to understand that they should put their phone on vibrate when they are in a place that it shouldn't be ringing. I found the video below on Engadet and thought it was a huge /facepalm. 

As Engadet points out, the real /facepalm is the guy at the end answers his phone and then walks out to talk to the person who called him. I bet the person who called him was watching the press conference and wanted to see if he had his ringer on or not. Then Gibbs owned the guy by making fun of his suit. 

Is it really that hard to turn your cellphone ringer off?