Cellophane is so thin and flimsy. What makes the wrapper on my Ritz crackers crackle and crinkle like a firework?
In: Physics
The bag wants to stay in its original shape. When you change its shape, it reacts by releasing energy, letting out clicks, heat and vibrations. This is the bag crying.
The more you change its shape, the more it cries. A bag is not one creature, but many creatures bonded together, and each shape change is breaking some of the bonds between them.
If a bag is smooth at the start, it will cry a little when you crumple it. If it has been crumpled many times and it has many creases it will usually cry more than it did when it was first crumpled.
Bags with different thicknesses of material will cry differently. Thick bags (like the bag of the crisp or of the cracker), their individual cries can be louder, but thin bags with many creases have many small cries which, when multiplied, can also be deafening, especially when hungover
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