Hello,
Shortcut of today is
Ctrl + U
Here is what to expect when you use it:
1. Makes selected text Underline – in most word processing software (e.g.: MS Word) and some text editing capable programs and applications both offline AND online.
2. Opens up View Source window in your browser (Firefox & Chrome)
3. Open up the Hue/Saturation box in Adobe Photoshop. Useful for example to turn a color photo into a black and white image.
DO comment if you know other. Thanks!