Ever wanted to skip around in a YouTube video without heading to the mouse? Reddit user Moriturii noticed that when a YouTube video is paused, pressing keys 1 through 9 skips to 10 per cent through 90 per cent, respectively, in a video.
You can see the shortcut in action in the video above. Try it yourself in the embedded video for a little Inception-style skipping-video-in-a-skipping-video recursion. There's not much to explain beyond that, except that 0 goes to the beginning of the video. It's a handy little shortcut to know if you're a keyboard lover.