"Lu... pa... ? Lu... pa... ?" - the citizens of Lefein until you learn their language

Some others:

"I am Arylon, the Dancer!" - Arylon

"May Link rest in peace." - a tombstone in Elfland

"Ho, ho, ho... how foolhardy to dare challenge me, KRAKEN the FIEND of the water." - Kraken

"Kraken, Fiend of Water, is a joke. A one-eyed squirrel armed with a piece of wet spaghetti could kill 20 Krakens before it needed to heal itself." - Dr Unne's boss guide

"You have legs!" - someone in Onrac

"The TAIL of a rat proves your courage. I shall give you the honor due true warriors." - Bahamut