David Rush from Idaho, U.S.A., who holds more than 200 Guinness records, has achieved another unusual success: shifting ice cubes from one tray to another with only mouth, within 30 seconds.

Rush initially thought the challenge would be easy, since he had previously broken similar records.

However, preparation proved more difficult than he had imagined.

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According to the rules, each ice cube was not to weigh more than two ounces [25 g], so it had to weigh carefully the amount of water per cube.

The next challenge was the ice temperature: If it was too cold, the cubes would climb to the lips as they began to melt, lose weight, and become more difficult to catch.

In the official attempt, on June 12th, Rush managed to shift 931 grams of ice cubes within 30 seconds, securing the new Guinness record.