Shares of the world’s largest coffee shop operator Starbucks $Starbucks(SBUX)$ seem to need a triple shot of espresso, laced with adrenaline. The stock, once a darling of the go-go momentum crowd (I am a charter member), has been a volatile bet since the pandemic hit. Notably, investors are beginning to worry about the trend at some Starbucks outlets toward unionization. Recently returned CEO Howard Schultz proclaimed that he’s not “anti-union,” but rather “pro-Starbucks and Starbucks culture.” However, he also noted that Starbucks did not get to be where it is by being unionized, which means that friction will likely be brewing at the company. And friction, of course, breeds uncertainty.As I detail below, my favorite coffee chain currently faces sev