What is a triple jump through a hoop whilst whistling the Star Spangled Banner?

So Long, and Thanks for All the Fish

They left the Earth just prior to its destruction, but left humanity one last message, a triple jump through a hoop whilst whistling the Star Spangled Banner, which, when translated, read, So Long, and Thanks for All the Fish.

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a triple jump through a hoop whilst whistling the Star Spangled Banner - video