GIFCTRL is a clever Tumblr that lets you play around with GIF frames, much like a digital flip-book. This may not sound like something that could eat up a Friday afternoon, but it really is.
For one thing these full-screen beauties have been expertly selected. They include clips from Beyoncé music videos, presidential debates, cult movies, boxing matches, as well as slow-mo footage of bombs going off. What's more, you can 'add your GIF' by pasting a link in the bottom left corner. [GIFCTRL via Twitter]