My friends and I often do "Top 15" countdowns.
It started as a way for a few colleagues to hype ourselves up for the release of "The Life of Pablo" – by counting down our top 15 Kanye West songs over lunch in the 15 days leading up to the release.
Since then, we've kept the tradition alive, posting our updates & rationale from (now) different companies & different coasts.
A good Top 15 countdown is characterized by spirited debate, relentless mockery, an open heart, and a firm belief that there is no difference between "my favorite" and "the best."
(Notably, the last item is not something I bring to my design practice).