He also loves the exercauser, and will bounce up and down in it all day, with a big smile on his face. And when he gets excited, he likes to yell out in glee.
When Oliver smiles, he smiles with everything. His entire face crinkles up, and it's like that's just not enough to express his feelings, so he tightens his fist and literally shakes his entire body. It reminds me of a puppy dog wagging his tail!