Zach Straley, also known a "Zeedude," also known as a dude who somehow has more than zero iPhones to drop in water for fun. Zach tested the iPhone 6s and the 6s Plus to see if they were waterproof. Unlike Samsung's new phones, the iPhone is not advertised as being waterproof. Turns out, they are! (According to this guy. Don't sue us.) In the video, he unboxes both phones, turns on their timers, and drops each of them in a bowl of water. He then takes them out after an hour and they're both still fully functional:

Sources: YouTube/Zeedude