Cadillac Converter

What the hell is a Cadillac Converter? And will it turn my Hyundai Excel into a Cadillac?

Don't you hate it when people mis-pronounce words? I wonder whether they pronounce the word that way on purpose, or if they really don't know the correct pronunciation.

I'm one of those people that likes to correct people all the time. I know people hate it, but I think I'm providing a public service. If you sound like an idiot in front of me, isn't it my duty to correct you so you don't embarrass yourself in public?