~ Click on the objects to make the crab interact with them. ~ Click on the crab to make him say hello. ~ Press the 'W' key to make Cory Crab wave. ~ Press the 'C' key to make him click. ~ Press the 'R' key to reset after Cory interacts with the objects.
For other cool+easy ideas, click on the 'Tips' button to the right of the 'SCRATCH' logo in the top left corner; where this idea came from.