It's Dangerous to Go Alone
Origin: The Legend of Zelda
We all need a little protection sometimes, just a little something to keep us safe from the world's dangers. For Link, that was a sword given to him by a kindly - and just a little creepy - old man living in a random cave.
The brilliance of this meme is that the sword can be supplanted with anything and the viewer instantly begins imagining defending themselves from monsters and demons with it, no matter how absurd that may be.