Hammer
There’s a piece of jelly, soft and jelly-like obviously. There’s a hammer that is striking the piece of jelly. The impact from the strike makes the jelly bend one way and before it has time to bounce back, another piece of nail strikes it from another direction. Eventaully it is being struck from every side. Each strike, faster and more powerful! The piece of jelly hardens with each strike and eventually becomes a piece of wood. A log that just sits there, bleeding, with nails poking out of it.