I'm sure a lot of us are familiar with Yusei's milk obsession...
I thought it'd be a one-of-a-kind sort of a thing, but I was watching a music video from Taiwanese musician Jay Chou (for
a song about busy cowboys, of all things), and guess what I see?
Sorry about the bad quality gif; I had to cap off YouTube.
The accompanying lyrics:
Although I am a cowboy, I order only milk at bars
Why don't I drink beer? Because beer is harmful to the body
THIS CLEARLY MEANS that either Jay learned from Yusei, or Yusei learned from Jay, or they are good friends who bonded through this idiosyncrasy and regularly go to bars together to drink milk.