A few months after Spider-Man's introduction, publisher Goodman reviewed the sales figures for that issue and was shocked to find it was one of the nascent Marvel's highest-selling comics.:97 A solo ongoing series followed, beginning with The Amazing Spider-Man #1 (cover-dated March 1963). The title eventually became Marvel's top-selling series:211 with the character swiftly becoming a cultural icon; a 1965 Esquire poll of college campuses found that college students ranked Spider-Man and fellow Marvel hero the Hulk alongside Bob Dylan and Che Guevara as their favorite revolutionary icons. One interviewee selected Spider-Man because he was "beset by woes, money problems, and the question of existence. In short, he is one of us.":223 Following Ditko's departure after issue #38 (July 1966), John Romita, Sr. replaced him as penciler and would draw the series for the next several years. In 1968, Romita would also draw the character's extra-length stories in the comics magazine The Spectacular Spider-Man, a proto-graphic novel designed to appeal to older readers. It only lasted for two issues, but it represented the first Spider-Man spin-off publication, aside from the original series' summer annuals that began in 1964.
The practice may have originated in a Celtic festival, held on 31 October–1 November, to mark the beginning of winter. It was called Samhain in Ireland, Scotland and the Isle of Man, and Calan Gaeaf in Wales, Cornwall and Brittany. The festival is believed to have pre-Christian roots. After the Christianization of Ireland in the 5th century, some of these customs may have been retained in the Christian observance of All Hallows' Eve in that region—which continued to be called Samhain/Calan Gaeaf—blending the traditions of their ancestors with Christian ones. It was seen as a liminal time, when the spirits or fairies (the Aos Sí), and the souls of the dead, could more easily come into our world. It was believed that the Aos Sí needed to be propitiated to ensure that the people and their livestock survived the winter.