In this video, the shooter demonstrates how little amount of spread you get from an average shotgun at "indoors" distances. This should help to dispel the myth out there that you hardly need to aim a shotgun in order to hit your target. This seems to be a very common misconception about the shotgun.
In an earlier post, Shotgun or AR15 for Home Defense, I mentioned this myth.
In the video above, he is using birdshot (not recommended for use in self defense). However, the point is made regardless.
It is actually the concentration of firepower that makes the shotgun so powerful.
Here is a follow up video made by the same guy(s) about this same subject.