Every once in a while, someone on a large D1 s c0 r d server will gain the balls to send an @everyone message that isn't relevant.
[Basically a message that everyone on the server is notified about]
All of a sudden you have thousands of people being notified at the same time, ready to seek blood. The chaos that then unfolds is a sight to behold.
Just imagine a clusterf* ck of messages, images, and gifs, usually also containing a few more @everyone messages. Thus anyone who wasn't yet annoyed will get spammed with notifications and might even decide to join the battle.