You know, POE-TAY-TOE? Boil 'em, mash 'em, stick 'em in a stew?
I'm sorry, I couldn't help myself. You know, the only place I've ever heard anyone say "potahto" is in that saying, "I say potayto, you say potahto." I've never actually heard anyone use that pronunciation in normal conversation.
Also, not quit on topic, but isn't it weird that the second "o" in "pronounce" gets dropped when you write "pronunciation"?