Why it worked
The video leverages the "day X of" trend and the inherent curiosity around "secret menu" or "over-the-top" Starbucks creations. The excessive amounts of syrup and sugar, combined with the visual appeal of the final drink, create a "train wreck" viewing experience that is highly shareable and engaging.
Summary
A Starbucks barista demonstrates the creation of a highly caloric and sugary drink, starting with multiple pumps of marshmallow, vanilla, and white mocha syrups, followed by espresso, almond milk, and whipped cream, topped with caramel sauce. The video highlights the excessive ingredients and concludes with the final drink's nutritional information.
Product placement
Starbucks (appears as a logo on the cup and as the setting/brand of the syrups and espresso machine) - acts, its interface is operated to make drinks, visible result is the drink, removing it would change what happens in the video.
Marshmallow syrup (appears on pump bottles and is added to the drink) - acts, its interface is operated to add syrup, visible result is the drink, removing it would change what happens in the video.
Vanilla syrup (appears on pump bottles and is added to the drink) - acts, its interface is operated to add syrup, visible result is the drink, removing it would change what happens in the video.
White mocha syrup (appears on pump bottles and is added to the drink) - acts, its interface is operated to add syrup, visible result is the drink, removing it would change what happens in the video.
Espresso machine (appears in the background and is used to make espresso) - acts, its interface is operated to make espresso, visible result is the espresso shot, removing it would change what happens in the video.
Caramel sauce (appears in a squeeze bottle and is added to the drink) - acts, its interface is operated to add sauce, visible result is the drink, removing it would change what happens in the video.
Almond milk (appears in a carton and is added to the drink) - acts, its interface is operated to add milk, visible result is the drink, removing it would change what happens in the video.
Whipped cream dispenser (appears and is used to add whipped cream) - acts, its interface is operated to add whipped cream, visible result is the drink, removing it would change what happens in the video.