In the arcade game Deal or No Deal, based on the TV game show of the same name, you have to try to keep your eyes on fast-moving cartoon suitcases as they are shuffled on the display. These guys used their phones to videotape the shuffling in slow motion so they could keep track of the prize winning suitcase.
At the start of the game, 16 briefcases are shown open with their contents visible (points between one and 800). The cases are then closed and rapidly shuffled.
Normally, it is impossible to follow the case with the highest number of points, but these teenagers film the shuffling on their phones and then quickly review the footage in slow motion so that they can determine the position of the winning case.
Armed with this information they then proceed to select the correct case and make the optimum deal at the end.
The filmer writes: "The teenagers play a number of games, and then got their tickets counted which ran into the thousands. Finally, they trade their vouchers for a major prize."