This powerful gun violence ad has a chilling twist you won't expect...

Whether you're a parent, student, or a teacher, you really need to see this!

The families of victims of the Sandy Hook shooting have come together to release a powerfully chilling new video with a surprise twist that highlights how easy it is to miss early signs of gun violence.

The ad, titled "Evan", has gone viral, gaining more than four million views in its first few days on YouTube.

Watch the confronting ad here.