Raising the Next Generation of SAHDs

After putting on his camoflage pajamas, Four went up to M who was changing LuLu, and began to profess to her his career aspirations:

Four: I want to be a policeman, a race car driver, and a stay-at-home dad on Fridays when I grow up.
[Pause]
"Can I do that?"
M: "Yes, I think you could do all of that."

Why just Fridays? Although come to think of it, its not a bad idea.