go sign

We were driving together and playing a kind of “I Spy” game. One of us just says, “I spy...a man in a blue shirt”, or “I spy...a red truck” or whatever. Then the other, when the object is found, exclaims, “I see it!”
We take turns going back and forth.
So I said, “I spy a stop sign.” And Naiya of course says, “I see it.”
Then comes the pause where she is supposed to chose the next object of the game and say, “I spy...”
Instead, though, she interrupts our play to ask me, “Mommy, where’s the Go Sign?”