Last night I watched the movie The Hunted with Tommy Lee Jones and Benicio Del Toro. At one point Benicio is on the run, finds some scrap metal, builds a primitive forge, and hammers out a knife with a serrated spine without tools in about three hours while the FBI is tracking him. Brilliant. Meanwhile, Tommy Lee Jones flint knapps his own knife during the same time, setting the scene up for a battle of homemade knives in the wilderness.
Even my non-knife wife couldn't believe this one.
There must be better (and worse) knife moments in movies.