I always thought I was a bit of a Photoshop expert when it comes to photo editing and digital manipulations. However, I was fortunate enough to use Photoshop (I believe it was Adobe Photoshop 7) when they have already refined and defined the user interface along with the tool functionalities. Although that version of Photoshop was not at all robust in comparison to Adobe Photoshop CC or CS6, it does offer a limited undo steps and some precision on selection and typography control.
The folks over at CreativeLive set out to find out how well Photoshop experts and instructors would perform when using Photoshop 1.0. Their reaction to the software is quite amusing.