Answer by Mike Hillyer:
As a hiring manager, let me tell you why I’m asking you to sell me the pen:
When I ask someone to sell me an arbitrary thing, I am looking to see if they do discovery or not. I want to know if they are going to learn about my needs regarding the imaginary product, how I use it, what I liked about my last one, etc.
If I ask you to sell me a toaster and you immediately start telling me about features and benefits, how many slices it can toast, how it can burn in a picture of Darth Vader, you are not getting hired.
If you ask me how often I toast bread, how many slices I need to toast per hour, what I liked about my last toaster, etc. then you made it through the question.
If you get asked this question, start asking questions!