It drives me nuts: you search and search for a video on YouTube… but when you finally find it, some idiot has encoded it in the wrong aspect ratio:
You can (sort of) work around this if you have the ever-popular VLC video player installed on your computer. Just open VLC and choose Media > Open Network Stream, paste the YouTube URL into the “Network URL” box and press “Play”:
When the video appears, keep pressing the “A” key until the correct aspect ratio is displayed:
This isn’t perfect, but it’ll work in a pinch!