Those were the works of George Barris: http://www.mustangandfords.com/featured-vehicles/1805-saga-of-the-sonny-and-cher-mustangs/
When we bought our Sonic a few years back I called it "Sonny" because there had to be a bright side to selling my Jimmy... Anyway, just before Christmas we bought a new Equinox. While trying to thing up a name, Hubby felt it should be "Cher" so they could be together again. And so we now have Sonny and Cher in the yard. Although we gave Sonny to our daughter so they are somewhat estranged.
That seems quite normal Fannie. I think Sunny and Cher were quite often estranged, but still saw each other.