I forgot to tell Isaak.
At the table tonight, after he had eaten enough that he wasn't quite starving any more, he sat back in his chair, looked around the table and announced, "Dodo!", then dissolved into giggles. He laughed so hard I was afraid he'd fall off his chair. He calmed down after a few minutes, waited until everyone else was eating again, and again proclaimed, "Dodo!", followed again by almost hysterical laughter. The third time he tried it, he couldn't even get the word out before he started laughing again.
I think when he gets into 2nd grade, we'll skip the Dodo example and substitute dinosaurs or Passenger Pigeons instead!