Lincoln MKT. Looks as if it runs by sifting huge volumes of plankton out of the air.
Lamborghini Veneno. Uglier than a vomit and scrotum sandwich.
Fiat 500 L. I absolutely loved the new Fiat 500 when I saw it. Brilliant looking, fun to drive car with bags of character. Then one day this monstrosity shambled past me. Despite my stoical appearance, I wept internally.
I'm sure there are many more, but these will do for now. I can't say I'm a fan of Toyota's new styling; I don't know what's going on with the new Yaris. The new Prius almost looks great, but then you get below badge height and do a spit-take. If you don't have a drink on-hand, you are compelled to go get one, just so you
can do a spit-take.
Despite this, IMHO it is far from the most offensive car to have ever reflected photons onto my retinas.