Oh, so many things:
Finally, after it took the Ogilvie Transportation Center Starbucks over 30 minutes to make my iced tea this morning (and I ordered it from 15 minutes away on my inbound train), it turns out the Starbucks staffing algorithm might be to blame. This is why I only get that one drink from Starbucks: it's really hard to screw up and usually takes them half a minute. Fortunately, I got my morning coffee at the cute local bagel shop on my walk to Cassie's day camp (and they gave Cassie a dog treat to boot), so I wasn't feeling homicidal.