When their laughter finally subsided he asked why she described him that way. She answered that when he got up and started walking before he was fully standing he waddled like a penguin.
He didn’t think the description was particularly flattering nor funny, but that didn’t stop them from laughing again.
There’s a saying that laughter is the best medicine and, in the future, every time they thought of penguins they started laughing. At that rate they’d never be sick.