The voices in their heads are escaping

Have you ever been part of a Silent Disco? If you're in it, everything must seem pretty normal. A great song comes on and you and your friends scream along to every word. Business as usual, right? Well, to the outsider, the whole deal is pretty funny, inspiring even. You see, everyone in a silent disco gets a pair of headphones, where the music is played and the DJ speaks through. So for everyone on the outside, all they see is a group of people singing a song and dancing to the beat of the... silence.