DM says: „The roads are precarious and rarely-traveled, for bandits and monsters prey on the foolish who leave the relative safety of their city walls.“
DM means: „Only 3 cities exist in the entire world. Sure hope you didn't make any urban-based characters!“

DM says: «You see the person that everyone has been referring to either reverently or in terror.»
Meaning: «You went to go pick a fight with that? You knew this was a bad idea, run for it.»
Players hear: «Boss Fight Ho!»

DM says: «I think a little mood music is in order.»
DM means: «Let's see you track your Power Attack when I'm pumping Metallica!»