In comments on the Cadillac in Europe post, Johannes Dutch left a link to a forum (amerikaanseautopagina.com) with a number of even more extreme examples of such contrasts. I just had to pick out a few of them, but head on over to see the rest. The Fiat 500 would make a nice hood ornament on this Imperial.
Renault Twingo meets Olds.
Renault 4 meets Cadillac ambulance.
’59 Caddy meets Mini, from the same era.
Fiat 126 meets Caprice.
Dinkey Toy meets Cadillac.
Euro-size parking lot meets Buick.
Buick Estate Wagon meets its little neighbor, whatever it is.
And Suburban meets Suzuki Alto.