like grandpa, like grandson

I often think my children take after their father’s side of the family far more than mine, but this evening the Little Guy was very Walterish.
He chose to skip watching TV so he could have extra time to read his book on the history of railroad signaling with his visiting grandparents (my dad and his wife). We were passing the book along the couch, each reading one page. Grandpa commented that it was a long book, and the Little Guy said, “Yep, 158 pages.” Grandpa had the book in hand, and checked; indeed, there are 158 pages. He decided to quiz the Little Guy: “What’s on page 150?” to which the Little Guy wisely answered, “Railroad signals.” Grandpa flipped to page 150, and held it up: two photos of railroad signals. The Little Guy glanced up and said, “Those are Griswolds,” which impressed Grandpa. Grandpa, however, doesn’t like to be shown up any more than the Little Guy does, so he said, “I know those are Griswolds.” The Little Guy didn’t want to be topped, so he added, “They work by counterweights.” Grandpa knew that too, which impressed and surprised the Little Guy. At this point the conversation deteriorated into: “I knew that.” “I knew that also.” “I knew that also also.” “I knew that also also too.”
For the record, yes, Griswolds work by counterweights, which flip the sign so it can be read by the passing train and by the cars on the road.