Photoshop Quick Tip: How come my Colour Picker looks funny?

This morning one of my trainees was having a problem with the Colour Picker in Photoshop. Normally, when you click on the Foreground or Background Colour Swatch (at the bottom of the Toolbox) it looks like this:



However, this morning it seems like the Photoshop elves had been at the whiskey and the colour picker looked like this instead:

If this happens to you, you can get your normal Photoshop colour picker pop-up back by pressing Ctrl + K (Windows) or Cmd + K (Mac) to open up the General Preferences dialog box. To make sure you get the one you want, under the Color Picker pop-up menu, set the chosen Picker to "Adobe."