Live SNG. What is the Ruling?

[bobpoker]

SNG down to 6 handed. UTG is not paying attention and still has cards. UTG+1 mucks out of turn starting a chain reaction of mucking around to SB before dealer or UTG realizes what is going on. Some mucked cards may be able to be identified. What is the ruling? Is the ruling any different in a cash game. Obviously, everyone should pay more attention. I would appreciate any imput from dealers or floorpersons.