Joaquim, disguised as one of the professors, entered the university library. He placed the CD player on the table in front of him; loaded the CD; cranked the volume full and braced himself as he turned it on. Surprisingly there was only a very very faint sshh. Joaquim then realized that he couldn't hear anything at all. He spoke normally, then yelled, but no one reacted. Awesome, he thought as he began flailing his arms around and shouting as loud as he could.
Unfortunately, the librarian, seeing him moving but hearing nothing, assumed he was choking and performed the Heimlich maneuver on him, knocking his wig off. This caused the librarian to perform the hind kick on Joaquim right out of the door.
But what has his roommate Lenny done? What was on that mysterious CD that had made everything quiet?