You were chilling in your dorm room/office, doing paperwork at your desk and listening to music simultaneously.

The song Closer by Nine Inch Nails was playing from your speaker. You nodded your head to the beat and sang the song as you did your paperwork.

You know the song word for word.

Ghost happened to to be in the room with you, also doing his paperwork. And as he listened to the words of the song, he raised an eyebrow at you.