Example:
Person one says Expedition everest, The queue area.
Person two says expedition Everest, Yeti scene and adds Star Tours, R2D2 and C3PO working on a star speeder.
Person three hasn't been on expedition everest, so chooses the control room scene from Star tours, and adds their own of pirates of the carribean, Jack sparrow peeking out of the barrel.
Person four now choose from star tours or pirates, and will in turn add their own. it continues like that from then on.
Sounds more complicated than it is!
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I'll start off.
Soarin': the flight over the aircraft carrier...
