You call that music?

The old man basked in the glow of the aftenoon sun. His peace and quiet didn't last long, though. The quite rude interruption came in the form of three teenagers loudly blasting music on a phone. Music might be a generous term, to the old man it sounded like a modem starting up.
"Will you shut down this infernal racket? Oh, when I was young..."
"When you were young, there were dinosaurs around!"
He didn't reply. He just took off his sunglasses, which somehow made the teenagers turn and run.
He put the sunglasses back over his unblinking, reptillian eyes.