Who, (or what) was Spring-Heeled Jack?

Who, or what exactly was Spring Heeled Jack? During the early 19th and 20th centuries, this anomaly terrorized the people of London. Though his story may seem like it was taken out of the pages of an Alfred Hitchcock book, many people claim that his existence was real. His very existence remains a mystery today and many seek to find the truth behind the various strange events of the past He was portrayed as being tall, thin, and full of inhuman vigor. Even the attire of this baffling being was describ…