Have a good laugh at this but how did it happen?

[displayfireworks1]

I have to warn you this video contains swearing and racial comments. I am usually not one for that sort of think but it is a funny video. It is one of those videos that get funnier the more you watch it.
I am posting it to see if anyone has an analysis on what happened. To me it looks like someone set it up upside down then lit it. It is either that or the bottom blew out. Have a good laugh but let us try to keep the comments clean.

http://www.youtube.com/watch?v=j7OGTSrXkg0&feature=related

[dragonhaert]

I also think that the cacke is setup upsite down.
If it was a tube that exploded you did not have the hole cacke that lift of the ground.

[Minishow]

I also think it was upside down, the cake dose a triple back flip and all the breaks were right on the ground, usualy if the bottom blows out you still get a low break.

[Pyro Nation]

OH MY GOD..... i was laughin way too much and crying... thAT cake was def upside down

[Palermitano2]

These are the consumers that need training ........and ruin the hobbie......