gear/speed up towards the end? ... or that have two discernible 'gears', slow then fast or even vice versa!
For example 'Tin Omen' by Skinny Puppy, starts with a malevolent chug then all merry hell eventually breaks loose...
http://www.youtube.com/watch?v=FIyL8ti3SME
I can think of lot's of cool Thrash tunes that do that too... but i'll leave that to you
Got any good ones?
Post clips if ye can!
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