@SapphireSeptember, I was on an early train one weekend with a friend, going down to visit a mate at his new house. Some teenagers got on and were playing some godawful, tinny pop through their crappy phone - my mate got out his relatively expensive phone, hit play on Reign in Blood and I dropped it into an empty glass to amplify it some more (because it was going to be quite a big party, we'd been asked to pinch pint glasses from pubs supply some glasses for beer, so we had a bag lined with jumpers and 4 glasses).
They either switched their phone off or retreated to the next carriage.