From the Department of Good Bad Ideas, fellow named mrspringer, who apparently lives in a land without either curbs or speed bumps, has managed to stuff the V-10 from a Dodge Viper into a Saab 9-3 Sport Combi wagon.
The exhaustive build is documented [in Swedish] on Zatsy.com. An SEO slideshow/gallery on Autoblog will suffice for all but the nuttiest readers.
mrspringer - Saab 9-3 SRT10 MegaPower [zatsy.com]
Saab 9-3 Sport Combi unlikely but awesome Viper V10 transplant recipient [autoblog via dt reader cam]