I noticed there is plenty of physics in people.  There is physics in the way our bodies were designed and in the way we physically move through life.  When gavin was sitting down by the chapel, i noticed he had his hand down on the ground because his center of mass was not supported by his support base.  HIs support base is his extended leg to his butt.  Because he is leaning back, his center of mass is past the edge of his butt and his upper body would fall to the ground like it did in the picture on the right.  He was sitting a little differently-leaning to the right and right hand supporting his center of mass-but had the same concept.  Someone came over and kicked his hand out from beneath him and his upper body plunged toward the cold cement floor.  So my theory was correct.  His center of mass exceeded his support base therefore leading to his instability.  I also noticed we humans were created with nice big support bases, our feet.  If our legs ended at a point it would be very hard for us to get around.  I think that is also why it is hard for toddlers and babies to walk because compared to the foot-body ratio of an adult, a babies ratio is much smaller.  Their feet have not grown in yet giving them small support bases so every time they lean slightly too much to one side, they fall over because their center of mass easily crosses the invisible support base line.