kcies13-SFGAm said: 
"I was thinking about an upside-down loop..... 
imagine a regular vertical loop, then, instead of going up, it goes down.  I don't know if they have them already, or if it would even work, but it would look neat. 
 
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May 5th, Gurnee, Illinois,  "I'm sprinting for V2""
   Hey, I've been thinking about something like that for years. But like Peabody said, negative G's. I guess it would have to have some kind of braking system to keep it slow, so that might defeat it's purpose. Well, I promise all of you, if I go make my own Coaster firm, I'll design one of these things (unless it already is around by then.)   
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V2, Deja Vu... how can it be better? Add Viper! Oh, wait. It's already there!