Tales From My Past - Crazy Lake Michigan

Before I relate this story, I swear it is completely, 100% true. I'll swear to God, Buddha, SpongeBob, whoever you want. I have a witness who was there for the whole thing.
   A few years back my friend Sean and I were in Milwuakee, WI on a road trip. We'd flown into Chicago and accidentally happened upon Uno, the real one, where you order your pizza when you put your name on the waiting list. Say what you will about a New York pie, authentic Chicago pizza is awesome. After stuffing ourselves on three-inch-thick slices, we drove to Milwaukee, and on the way had to stop at the Mars Cheese Castle in Kenosha. It's a cool place, but it smells like fondue. And the building is constructed with cinderblock, not cheese, so it's kind of false advertising. If they say 'cheese castle' I expect the whole thing to be made of cheddar.
   Anyway, we finished our business in Milwuakee and we had over half a day to kill before we had to be back at O'Hare in Chicago, so we went to Lake Michigan and rented bicycles. There's a bike path that winds around there, and even in August the wind off the lake was freezing cold. We got tired so we stopped at one of the park benches positioned every fifty yards or so.
   We saw an old couple walking together - it's not just a bike path - and they stopped at the bench next to us and spoke to the people there. Those people looked kind of confused and amused, but I thought nothing of it. The couple then ambled over to me and Sean.
   The man stood back, saying nothing, but the lady came over to us. She wore a pink and green pastel shirt, beige shorts, and she held her hands held up to her shoulders, palms down. She smiled. We smiled back. And then she said these exact words as she patted her hands on her shoulders.
   "Goody goody, goody goody, goody goody goo."
    Then she and her husband (I'm assuming) walked off. No explanation, they just went to the people sitting on the next bench over, and from the expression on those people's faces, the lady did exactly the same thing to them.
   .....
   Yeah. Freaky. And I swear it actually happened, Sean was right there for it, and to this day we are both completely at a loss to explain what the hell that was. Was she just bonkers and the guy was humoring her? Was she doing it on a dare? At her age? Was she marking us for death by ninjas at some time later in life? Who knows?
   That whole trip was full of odd things. Like the homeless guy Sean wouldn't let me have a conversation with, or the Miller Beer mad scientist's lair, or the Brewers game, or the dangerous convenience store in the bad part of town. All stories for another time.