Imagine the tantrums they'll throw, when they find out they're not welcome. This picture taken, circa 1952 shows little Peter Moore throwing a temper tantrum while on a visit to Bournemouth, Dorset. Evening Standard/Getty Images hide caption

itoggle caption Evening Standard/Getty Images

Levi Aron, left, is arraigned in Brooklyn criminal court Thursday, July 14, 2011, in New York. Aron, 35, is charged with luring 8-year-old Leiby Kletzky to his home on Monday, and then smothering him and chopping him up when he learned that a search was under way for the missing child. Detectives found the boy's feet in Aron's freezer. Louis Lanzano/AP hide caption

itoggle caption Louis Lanzano/AP

Virginia resident Karen Murphy's son died after being left in the family's car for seven hours. Prince William County, Va. Police/AP hide caption

itoggle caption Prince William County, Va. Police/AP