Step 1 : Introduction to the question "2. Crossing Tom Hanks with Cadbury's would give you which movie?"
...1. Once Upon A Forest 2. Forest Warrior 3. The Petrified Forest 4. Forrest Gump This 1994 story revolves around an innocent minded man, some of the major events in American history in which he takes parts, and all the lives he touched. Included in this tale is Forrest's love for Jenny, the only friend from his youth. It's a funny, sad and heart-warming tale, super-imposed on real media clips from America's post Second World War period. These include the Vietnam War, the hippie movement, and the destructive events around the 1974 Hurricane Carmen. Hanks wasn't the first choice for this role, nor the second. Both John Travolta and Bill Murray, incredibly so, turned it down. The film went on to win six Oscars, including the Best Actor for Hanks. (The clue in the question refers to the much-quoted line: "Life is like a box of chocolates...")
