In the episode "Homer vs. the Eighteenth Amendment", Homer builds a sculpture of a watermelon out of ham cubes.
In the episode "Homer vs. the Eighteenth Amendment", Homer is tasked with creating a sculpture for the St. Patrick's Day parade. He builds a large sculpture of a watermelon out of ham cubes, much to the delight of the crowd. Unfortunately, the sculpture is quickly destroyed by a group of rowdy teens.