Quote from Hal in Lois' Sister
Lois: How was the park? Hal: Oh, it was great. We had a blast. [places baby seat on table] Lois: Hal. Hal: I know, I know, he's filthy. I decided to let him out to crawl around in the dirt for a little while, he had so much fun rolling around with the other kids. Lois, you should have seen him. Lois: Hal... Hal: Lois, you can't treat the boy like he's made of glass. He'll be fine. We can clean him up. The important thing is that Jamie and I had fun together. Lois: This isn't Jamie. Hal: Huh. I know exactly who I switched him with.