See that rainbow trout right there? I snapped that photo on the morning of May 31st, 2014 while running down a canyon in Utah, training for a marathon. At a point where a waterfall meets a river, there is a calm pool of water with trout ranging from a few inches to over a foot in length.
As I stopped and stared momentarily, while catching my breath, I realized something. There are fish swimming an arm's length away from me and I have a waterproof phone. Rather, a waterproof case on my phone - an iPhone 5S at the time.
I stuck the phone in the water and realized I wasn't able to press the shutter button once the screen was under water (touch screens lose their ability to know where you're touching under water). Pressing the volume button on the phone produced nothing but blurry photos.
DING DING DING! Light bulb A turns on in Brain B! My earbuds are connected to the waterproof extension coming out of the earphone jack of the phone, so I can dip the phone fully under water and press the volume button on the earbuds as a "remote" shutter release. Voila! It works, and now you're looking at a nice sized rainbow trout swimming in a river in Utah, taken by an iPhone, completely under water. :) ...you're welcome.