“The Last Action Heroes: The Triumphs, Flops, and Feuds of Hollywood’s Kings of Carnage” (Crown, out now).The mishap left a slight droop on the left side of his face, and caused the trademark speech impediment the actor would later compare to the “guttural echoing of a mafioso pallbearer.”Stallone was taunted at school with nicknames like “Slant Mouth,” “Sylvia” and “Mr. Potato Head,” and later told reporters that his speech and appearance had left him “like a poster boy for a nightmare.”Life wasn’t made easier by a physically abusive father who beat him and his brother Frank Jr.