Terminator 2: Judgement Day - Magical Reappearing Rod.
At the end of the movie when the T-1000 and Arnie are fighting(when aren't they?)the T-1000 stabs Arnie in the chest with a metal rod and he falls back on to a railing. As he does you can see the rod go flying over the edge, but in the next scene it's back in his chest.
on 12-11-2000 and