Here's what would have happened if you had jumped on the Starbucks bandwagon early on.Starbucks (SBUX 1.72%) stock shot up this month after the company announced that former Chipotle CEO Brian Niccol was swapping burritos for beans. Under Niccol's leadership, Chipotle's stock increased by nearly 800%, and now investors are eager to see if he can deliver a fresh shot of success to Starbucks as well.If you've been holding on to Starbucks shares since its IPO, you're likely even more excited about what's brewi ...