Here's a video my buddy took of a huge bull that almost walked right over him in WY. He had a cow tag that he filled within 10 minutes of the video:
http://www.youtube.com/watch?v=c7Hm_AYuQ-E&feature=em-share_video_user
http://www.youtube.com/watch?v=c7Hm_AYuQ-E&feature=em-share_video_user