Dropping your iPhone in the toilet isn't an automatic death sentence if you have the Gooma Case Marine. Gooma's amazing smartphone case can be used on the iPhone and Samsung Galaxy S2, is just 0.25mm thick and is waterproof in depths of up to 10 meters (a little more than 30 feet). With practice, the company claims that the case can be put on in as little as 5 seconds.
The Gooma Case Marine is so thin, that you can even put your normal iPhone cover on afterwards. The best part about Gooma's waterproof case is that you can still use your phone when it is on, although you will have to take it off to access the power port and headphone jack. The case is currently being sold in Japan for $38, but those living in the states can pick it up for $71.