The camera on the iPhone 5S.
Apple wasn't the first smartphone maker to include a slow-motion camera feature, nor will it be the last.
But with more than 9 million iPhones sold in its opening weekend, and most of those expected to be the 5S, there are going to be a lot of slow-motion videos floating around.
We've compiled some of the best early ones from the past few days below.
Doing backflips on a bike, with a soundtrack:
A dog eating water, or in Internet terms, re-enacting the WHARRGARBL:
Horses being majestic:
iPhone 5S Slow Motion Test from Sean O'Bryan on Vimeo.
Backflips into the pool:
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