I read a story in Slate earlier this month about some sort of prehensile rugby law - which has lain dormant in American football for a century - affecting the result of a New York Giants/ Arizona Cardinals game.
Our correspondent notes:
The "cry down" rule makes sense in rugby, if only to signal the transition into that phase of play wherein everyone dry-humps everyone else. The rule's bastard American son, the "no effort" rule, has no business in modern pro football.
"That phase of play wherein everyone dry-humps everyone else", being the Yank for ruck I imagine. I suppose it makes sense from the perspective of the Atlantic.
Note to self: do not use this phrase in explaining rucks to ten year old newbie Halex this morning. His mother may not understand.