Keep in mind "come back calls" is what we call them. What I like to do is create quite a comotion on the ground. Inevitably you'll see a goose or two look back at whats causung all the noise. Be prepared to show them a "landing" goose. Sometimes the urge to land with a goose that has already landed is more than they can take. Hopefully the goose that looked back will turn and land. If that goose lands let him and keep hammering the parting geese. Maybe they will get over thier concerns and land as well.
I'm not sure why it works, insert your own theory here. Maybe the more agressive the geese are on the ground the more thre flight geese feel there must be the mother load of corn on the ground. Perhaps they are intrigued by all the noise from the feeding geese and come back to make sure they dont want to eat. I dont really know. I dont think they have that level of cognitive thought.
More than likely I think all the extra noise sparks some sort of emotional or instinctive response. I think they "think" about anything.