MEDINA, Ohio (AP) - When Cynthia M. Divecha's 18-year-old son carried groceries into the family's house and put them away Tuesday, she was shocked. ``Call 911. I'm having a heart attack,'' Cynthia M. Divecha said sarcastically. John Divecha, thinking her mother was serious, did. When he discovered his mother was teasing, he called back, but an officer already was en route. ``I thought he knew I was joking,'' Ms. Divecha said. ``But he knows I have been a little stressed lately.'' She said her son usually needs considerable prodding to do household chores. ``But it figures. The first time he actually does something I ask, and it's wrong,'' Ms. Divecha joked.