What's the deal with sake in a box?

Is it east coast vs. west coast, because I have no idea what your question means.

I’ve never heard of this; can you please provide a link to an article or YouTube video? Preferably one with a dancing tiger in it?

It is like when I poured part of my 40 on the lawn the night 2Pac was killed.

The over flow is just Japanese Xenia.
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Is your question choko vs. masu? Or choko inside masu?” Or the about sake set?

So maybe this helps? “The waitress brings two little, square wooden sake cups, called masu. She places the masu on a small, shallow dish and pours the sake into the masu until the sake overflows a bit into the dish. My wife explains to me this is a Japanese ritual of abundance. Sake is abundant enough to let it pour over the top. For mine the waitress lets fly with abundance until we almost abundantly pour over the sides of the little dish. My sake masu sits in a moat of sake abundance.”

It’s a Japanese tradition. It’s to show that they’re not shorting you.