Treat your ability to sell a pen in an interview as the “cherry on top” of the rest of your interview. It’s a simple way for you to put your sales skills to the test and show your interviewer how you can do the job, but it’s not the only way you’re going to get the job. A good salesperson knows how to do many things, and the rest of your interview, which will cover more than just your selling abilities, will be just as important.