My party, after realizing the monster they’ve been fighting is way too strong to beat, but they need to pass through its cave-

Tiefling Monk: I attempt to speak to the creature in Demonic

DM (me): what do you say?

Monk: OH UNHOLY BEAST, PLEASE LET US PASS WE MEAN YOU NO HARM

Me: The creature replies in Common, “WHAT?”

*The entire party proceeds to die of laughter*