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What do you mean by "try this"? Is "U U D D L R L R B A" some kind of shortcut combination?

It is the Konami code.

Ha, that is a fun Easter egg :)

Check the console for another one.

It doesn't seem to work for me?

Don't use the letters, use your arrow keys to represent (U)p, (D)own, (L)eft, (R)ight and 'B' and 'A' respectively. e.g. ↑↑↓↓←→←→ B A

Love it. Lots of websites intermittently have included it to add some fun to the site. [0].

Ha ha, great one. Thank you.