Just because you're a Costco member doesn't mean that you can act nutty in the store. <br />At least that's what dozens of Costco workers recently told Business Insider when they spoke to Costco employees about their main gripe with shoppers. <br />Business Insider rounded up 31 things that Costco workers are dying to tell shoppers, but can't. <br />They wish that they could tell Costco patrons: <br />1. Have your membership card ready at the door. <br />
