While taking one of the increasing number of 'bike trips' through the African wild, a giraffe was not happy with two cyclists who encountered him. He just wanted them out of his home. Here is the decription of the video from you tube.com
While riding in the Groenkloof Nature Reserve in Pretoria, we encountered a giraffe. He was very "tame" and we took several photos of the animal. Then he became quite aggressive. He trampled Louis Rex's R30k bicycle and chased him around a group of trees. He later also "attacked" me and chased me around the same trees.