In a somewhat related vein, the main objective of any top class side scrummaging is to win a penalty at the scrum. To this end, many front row forwards will allow the scrum to go down in order to con the ref that the other side is collapsing, problem being it's bloody hard for a ref to tell who is doing the collapsing. Every sport has con artists who try to get something out of nothing, it does seem horribly prevalent in Football though.