The Lighter is an object that holds signifigance for WALL-E and EVE. It is used early in the movie as a symbol of their relationship and WALL-E later uses it to convince EVE to use the plant to return to Earth. In the original draft of the movie, the lighter had more signifigance; WALL-E used it to repair EVE after she was damaged by AUTO. However, this scene was cut in the final draft.