This situation has happened to all of us- you and your friends want to listen to some music on your smartphone/iPod/iPhone but you don't have any speakers laying around. The downward-facing speakers built in just aren't loud enough to play music for everyone to hear over background noise. Good news! There is an easy solution, just drop your iPhone, smartphone or mp3 player into an empty glass.
Photo via lifehacker.
When placed onto a hard surface, the glass amplifies both bass and volume so that everyone can hear. We have personally tested this in noisy kitchens, backyards, and even running water. The volume is significantly and instantly increased to a decent level.
