Robert F. Kennedy Jr. couldn’t have a snake in the grass. The wildman Health and Human Services head once came charging over to a little kids’ birthday party after hearing that a snake was in a nearby garden, ripe for the taking, according to his sister. While the innocent, unsuspecting children were busy enjoying the birthday party, RFK Jr., who lived a mile down the road, showed up armed with a pillowcase and a bedsheet, his sister Kerry Kennedy recounted.