An incredibly dull, weird or over exaggerated story is a "Plato" story, usually told with a lot of excitement. Plato refers to the ancient Greek Philosopher known for his theory of the cave.
Person 1: Oh my god funniest thing ever, I was almost late this morning.
Person 2: Oh Plato! The things you say!
Person 1: Guess what? My leg hurts because I bruised it! (Laughs)
Person 2: You don't say Plato?