A long time ago in a galaxy far, far away,

A boy from Wisconsin and a girl from Texas played L4D2. They killed the infected with much joy and for many a year. Then, they met in real life, had two kids, and stopped playing video games. All the world became sad and gray.

Eight years later, there came a pandemic, and once again, the girl and boy began to play video games again.

Liability disclaimer: I'm not a real doctor. I just play one on the Internet.