A guy who worked at Starbucks for almost 10 years posted a video about the "foolproof way" to get a free cup of coffee. First of all it has to be IN the store. You simply ask a barista to do a coffee tasting with them.
They'll prepare any pastry you want with whatever coffee you want, and you'll do the tasting together. According to him, they love doing it, but some of the comments say it's on hold during Covid.
(Here's thevideo.)
(Photo: Getty Images, Loic Venance/AFP)