The other sister said, "it's pronounced KissIMMEE."
They argued about the pronunciation for a bit, and not being able to agree on it, they decided that they would stop in a local hamburger place and ask one of the locals.
So they went into the place, sat down in a booth. The waitress came over to them and asked what they would like to eat.
The one sister said, "Before we order, we are from out of town and we would like you to very clearly and distinctly pronounce where we are right now."
So the waitress, very slowly says "Burr gerrr Kinggg."