My dad was test riding my motorcycle that he put together with old parts in his garage. He was stopping at a stop sign and he put his foot down. When he put his foot down, he didn't bend his knee, and because he didn't bend his knee, be snapped his tibia in two places. He managed to ride it home and lay it down in the drive way. Then because my neighbors garage door was open he yelled for our neighbor to come out side. He heard my dad and ran over and asked what was wrong. Then he went inside and told my mom to call 911.
http://www.lascointl.com/doors/images/ambulance.gif
http://www.calcoapps.com/images/fire%20truck%205.gif
http://www.doughayse.com/content/img/f17122/police%20car.jpg