WASHINGTON, D.C. - AP sources reported former President George W. Bush was observed in Mexico City last week carrying a vial labeled with a biohazard warning. "He wore sunglasses," said an unnamed source, "but I've seen enough giant puppet heads in demonstrations to know George Bush." According to the source, Bush was last seen sneaking the vial into a pig pen. Shortly afterwards, the swine flu outbreak began. "Draw your own conclusions." AP won't release the source's name because he told his boss he'd be at a funereal that day, instead of goofing off in Mexico City.