[It may be late in the day, but Puck's holed up in his room having a solo jam session with the guitar he got from the closets, which happens to be broadcast to everyone in the mansion.
He's chilling out playing the chords to the song he wrote,
Big Ass Heart, unaware that people can actually see and hear him.
It feels good to play and get his frustrations at being stuck in the mansion out. Plus, the song is totally awesome, so it's a win-win situation all around. For Puck, anyway. For everyone else, maybe not so much...]