The story of Spring-Heeled Jack is a part of London folklore; the first sighting was in 1837. He is described as "a most hideous and frightful appearance, and vomited forth a quantity of blue and white flame from his mouth, and his eyes resembled red balls of fire." One report claimed that, beneath a black cloak, he wore a helmet and a tight-fitting white garment like an oilskin. Many stories also mention a "Devil-like" aspect. There are many theories about the nature and identity of Spring-heeled Jack. This urban legend was very popular in its time, due to the tales of his bizarre appearance and ability to make extraordinary leaps.