In Korea, there are these wandering food exploders. You go to them with your own peas, beans, anything dried really and they put them in a heated pressure chamber. After heating, the pressure is rapidly released, which causes the small amount of water remaining in the food to boil off and turns them into a fluffy matrix similar to rice crispies.

The machine makes a sound very similar to a gunshot, so the operatora shout something to let people know.

Rice crispies and some chips are made with a similar process. This also works for dough.