Someone should build a coaster with an underground loop - where you'd plunge into a tunnel, like the bottom of the first drop of Raging Bull, but there would be a loop ! Or, a corkscrew might work better, since they wouldn't need to be as "deep". Or...some sort of hybrid between a Flight of Fear type coaster and a hyper twister - where the coaster appears "normal", but at some point enters a dark building where the elements/inversions are hidden. This would be so intense !
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Current favorite coasters:
Wooden: 1) Beast 2) Raven 3) Son of Beast 4) The Boss 5) The Legend
Steel: 1) Raging Bull 2) Millennium Force 3) V2 4) Wild Thing 5) Mr. Freeze