Last month, I talked to you about a fun yet useless application called Sonic Lighter. At the time, we even got an interview with Jeff Smith, the CEO of Smule, the company behind Sonic Lighter. A month after Smule launched its Sonic Lighter to worldwide acclaim, they release their newest complementary product, Sonic Boom in the  App Store.

Sonic Boom [iTunes Link] turns your iPhone into a virtual firecracker that can be ignited using your finger as a virtual match or a second phone running Sonic Lighter. Strike the match, ignite the fuse, wait…BOOM!

Sonic Boom’s real-time explosions can be documented around the world – since it first became available about 36 hours ago, over 7,500 explosions have been detected. While explosions thus far have been concentrated in North America and Europe, several recent explosions were detected in the town of Curepipe, Mauritius in the Southwest Indian Ocean.

It’s still useless but it’s still fun!