In his 2011 autobiography "God, If You're Not Up There, I'm F*cked: Tales of Stand-Up, Saturday Night Live, and Other Mind-Altering Mayhem", Darrell Hammond reveals that he had trouble sleeping at the time and took steroids before the show. This made him very springy and finely tuned for the next 16 hours, and his impression of Regis Philbin became so maniacal that it almost turned into Porky Pig (according to Hammond).