In my opinion, any coaster that has a name that could be themed really well but isn't! IE: Raptor, etc. Really it depends on if you're just considering "theme" parks versus "amusement" parks, which don't typically have themeing.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html
