The Walking Dead Reference:

Go to Mugambe's quest, in which *slight spoiler* you must kill his infected wife and daughter, the wife being a walker and the daughter being an infected. This is in Act 2, or when you are in the city of Moresby. Continue through his quest as you normally would, but when you reach the door you must break through to discover the wife and daughter. Stop and look to the left of it. To the left is the extremely popular phrase "Don't open, dead inside."