The usual approach is to serenade engineers with online postings involving wandering monkeys or battling robots, which rapidly morph into fiendish challenges of math and logic.
It is no wonder merchants are feeling frustration and anger that their stores are being considered as little more than showrooms by some shoppers -- showrooms displaying merchandise that, if the people wandering the aisles go home and buy from an online vendor, will provide not a cent in revenue to the owner of the real store.