The words almost never sound like trouble before they go out. They sound fine. Sometimes they sound clever. Someone reads them aloud. Everyone nods. And then they go live. In South Korea, Starbucks Korea launched a tumbler promotion called Tank Day. Tank referred to the shape of the cup. The campaign included a playful sound effect: tak. It launched on May 18. That date is the anniversary of the 1980 Gwangju massacre, when military tanks entered the city and hundreds of civil