On the first Amon Hen level (not the Orc Dam, but the one where Sam is snatched up by the Ringwraith at the beginning), you will have a chance to see and talk to Gollum. To perform this trick, first kill the wolves with Frodo. Also get rid of the Uruk-hai that come charging for you. When you run past the cave that the wolves charge out of, continue on until you see a gap open up before you, and two Orc archers trying to reach you with their arrows. Instead of dropping down, go to your left and up the hill. Then, go back the way you came, and run down to the river's edge. You should hear Gollum yelling in fury. Once again, take a left and up the ridge, where there is now a fallen tree log. Cross it and start speaking with Gollum. After the discussion, he will toss you a fish, which serves as your weapon for the remainder of the game (and is actually much more deadly than your sword!)