In the game Fallout 3, you come across a town run by children called Little Lamplight. You can receive various "quests" here, but one in particular has come to the attention of many Youtube users.

The mission is called "A Sticky Situation," where an 18 year old boy, per se, asks you to escort him to another town called Big Town. Along the way, though, is where the fun starts.

As soon as you walk out of Little Lamplight, he will start talking. "Are we there yet?" he might say, or "Why is this taking so long?" Every once in a while, he will make up a story.

Ex. I know, let's make up a story to pass the time. Once upon a time, there was this man. His name was Joking Joe, and he went around making everybody laugh really hard. And one day this spaceship, from outer space, came down and this big green alien started eating people. And was our hero scared? You bet he was! He cried like a little baby, wah wah wah. And all his friends laughed at him. The end. That's all folks.

After this, he will either return to his questioning of if you are at Big Town, or simply make up another story.

The first video encompassing him being killed is this one, by Drakortha:

Here are another few examples of Drakortha's work:

Here are a few examples of fan made material.