I've always imagined this concept: It may sound improbable, but I'm sure some company (*cough*Intamin*cough*) could make it work. It would start out as a steel looper/hyper, perhaps launched, before reaching a MCBR. Upon dropping out of the MCBR, however, it changes to wooden coaster track with the layout of a GCI twister. Yeah, I know, it sounds crazy because wooden and steel coaster cars are very different from each other, but I think it could happen in the future.