Why do people randomly shoot in glitch tutorials?

[Block Buster]

Ok so I have had the new call of duty modern warefare 2 and was going onto machimina's youtube channel and here's what I saw for the map glitch videos.
http://www.youtube.com/watch?v=rmP8L5hZmbI
http://www.youtube.com/watch?v=xFWIsgw6j0s
So after seeing these and more I have been wondering. Why do they always seem to shoot off at random?
So feel free to say why you think they do this or if maybe there is a logical answer for the random shooting.

[Ad Bot]

[Thorax]

So they can be cool on the internet.

[Zenthrox]

I have the same habit when walking around a map.

I think it's just a case of keeping themselves entertained while they're recording.

[IsaacKronenFaust]

I thinks it just to tell the locations you can shoot at, like in the Terminal map he fired at the windows of the Airport lounge while standing on the luggage carts, to show you can get a clearer shot at point A, from on top of point B.