About this "The Simpsons" episode:

The Simpsons - The Wizard of Evergreen Terrace is the 2nd episode of season 10 and number 205 overall in the series.
In this episode Homer discovers that he has not done anything in life that will be remembered after he dies, so he decides to become an inventor like Thomas Edison. However, his initial inventions such as an electric hammer are considered unpractical and are not well received. After a period of depression, Homer comes up with his first good invention—a chair that cannot tip over—only to discover that Edison also invented the same design. However, Edison's invention has remained unnoticed in Edison's preserved office at the Edison Museum in New Jersey, so Homer sets out to destroy it. There, he has a change of heart and returns home, only to leave his electric hammer behind. When the museum staff members find it, they believe it is an undiscovered invention by Edison. The hammer becomes a success and Edison's heirs earn a lot of money, making Homer angry.