Guild wars 2 had something like that. You would have 20 to 50 toons hanging around where the dragons would attack and there were critters there you could thump on while waiting. When the dragons finally attacked, the numbers if players would swell to uncountable. During the fight if someone went down a complete stranger would be healing you to continue the fight to get the big loot chest at the end. Good times......good times. And a capital idea! Bungie should send u a tshirt for causing a great trend with this post. :-)