Lucas Etter's fingers move so fast, it really looks like the video is in fast-forward. But when the 14-year-old from Lexington, Ky., triumphantly slams the cube on the table, the clock shows the truth: 4.904 seconds, the fastest anyone has ever solved a 3x3x3 Rubik's Cube. Guinness World Records confirmed the feat Tuesday.

The world-record-breaking solve is incredible, but the reaction of Etter's fellow "speed cubers" at Saturday's event in Clarksville, Md., is the sneaky highlight.

Take a look for yourself:

YouTube

Guinness World Records added: "Incredibly, the event had seen the record broken once already earlier in the day, with Keaton Ellis, a fellow speed cuber from Maryland, managing to solve the cube in 5.09 seconds, beating the previous record of 5.25 seconds set by Collin Burns back in April."

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

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