I didn't see it, but...

Matthew reports that when we were at the pool yesterday, Shoshanna was playing next to another toddler (about her same age). She had a toy train, he had a toy bus. He really wanted the train, but Shoshanna wasn't giving it up for anything. So she was pushing the train around saying "Beepbeep!" (which she says for any moving vehicle), and he was next to her, eyeing the train but pushing the bus, and saying "Choochoo!"