Similar experience: First ever game I ran (Lost Mines of Phandelver for my friends), they were ambushed by goblins and player Bob says: "I jump on the wagon and start playing my bagpipes."
DM: "are you casting a spell?"
Bob: "Nope."
DM: "Are you giving inspiration?"
Bob: "Dude, I just wanna play my bagpipes"
DM: "The four goblins pepper you with arrows first and you topple to the ground unconscious."