"Completely random. Completely unbiased. Completely luck of the draw," Potrock said. "What we created was a mathematical model, a randomizer, that will select the different dream giveaways each and every day.
"It gets into detail like, it'll be the fourth person to walk through the exit of Rock 'n' Roller Coaster at 3:01 p.m.," he said, describing a hypothetical selection. "And we've even gone so far as to say, if two people are walking through the doorway at the same time, it's the person on the left."
Winners will be split between those visitors who show up on Disney properties, and those who send in postcard entries.
To avoid spontaneous scenes of envy and disappointment among nearby people, major prizewinners won't be told what they won on the spot.
"We're not going to announce that in front of hundreds of other people who were so close," Potrock said. "We're going to celebrate later in the day by putting those people in as grand marshals in the parades."