It's not something you can download from the apps store, but if you've got an European version of the iPhone 3GS, you might be lucky enough to have the iBomb feature. Unlike the standard weak battery life and delicate screen, which all iPhone users enjoy, there have been reports in Europe of exploding iPhones.
How do you know if you're one of the lucky ones? Well to start, reports seem to be isolated in european phones, if your phone starts to make a hiss sound, you're moments away from glass shards and possibly fire! Make sure you pass it off to the nearest bystander and wait to see what everyone else is missing out on.
real news story:
http://www.eweek.com/c/a/Mobile-and-Wireless/Exploding-iPhones-Are-Latest-Headache-for-Apple-618978/