Boom development...

3 ideas for BOOM developed into storyboards. 

First idea: the oo's expand and explode over the entire screen making it go black. 

Second idea: Start with an empty frame and then suddenly the words burst onto the screen from the bottom in an explosion. This would be done using a single line. 
Third idea: The boom bursting onto the screen from bottom left, the letters would continously get larger and fill up the frame.