A whoopee cushion is a practical joke device designed to make a sound resembling flatulence when someone sits on it. Typically made of rubber or plastic, it is inflated and placed on a chair. When a person sits down, the air inside is forced out, creating a funny noise that often leads to laughter. Invented in the 1920s, the whoopee cushion has become a classic gag toy, often associated with practical jokes and childhood play. It is commonly found in novelty shops and is popular at parties and gatherings, providing lighthearted entertainment for people of all ages.