Why it worked
The video taps into relatable "contrarian" behavior and a daily ritual, presented in a short, engaging format. The humor of doing something specifically because a parent dislikes it, combined with the visual of chugging coffee, likely resonated with viewers.
Summary
The creator documents their 234th day of chugging coffee from Dunkin' every morning, as a way to spite their mom who dislikes it. The video shows the interaction at the Dunkin' counter and the creator drinking the coffee.