@freemo When I was interviewing candidates for jobs in SQL my idea was to have them solve a problem like how to design a database to manage WIlly Loman's missionary book.

However, when I would get some of these young guys in, they will have never seen or read the play. Or never done old school sales where they used a "missionary book."
So for a 15 minute interview I ended up trying to explain the Play or Sales techniques to someone instead of moving forward with questions about table design and so forth. I had to learn to make much simpler examples. Because things you assume are common knowledge, aren't always so common.