10. The narcissists

Narcissist shoppers are people who enter a dressing room with an armload of clothes purely to snap photos of themselves that they can share on Instagram later. The pros know how to silence their phone in the dressing room so it's not so obvious, but the newbies use flash, talk loudly, and do everything to annoy those who are queuing up because they legitimately intend to buy something. Guys and gals, if you're going to get snap-happy in the changing-room, buy at least one item to make it worth our time to wait for you.