what does it all mean?

Talking to Little Boy can sometimes be like "Who's on First." We talk in circles and go nowhere sometimes. Take this morning for example:

Little Boy mumbles something as he comes into my room at 6:30.
Me: What did you say?
LB: What?
Me: What did you say?
LB: Excuse me.
Me: No, not what DO you say, what DID you say?
LB: What?
Me: You said something, what was it?
LB: What did I say?
Me: That's what I want to know!
LB: I don't know.

I still don't know what he said. It must not have been very important.

Little Boy is very into signs. He wants to know what every sign says and what it means. He understands STOP signs and that the yellow sign with the picture of the see-saw on it means that a park is coming. Some signs take some explanation---like the orange signs telling us not to dig there because there are buried cables, and signs that say NO PARKING. Why can you park on the street in some places, but not others? Little Boy wants to know. I don't know, Little Boy, I just follow the signs.

Other signs Little Boy interprets for himself. At the park there is a sign that has a dog and there is a little pile of doggie doo behind the dog. The picture has a circle with a slash (you know--the "no" sign. Is there a name for one of those?) He asked me what that one meant and I told him "It says you should keep your dog on a leash at the park." "No!" said Little Boy. "It means no pooping at the park." That would actually make more sense given the poop in the picture. The hot water heater in our garage has this sticker affixed to it:

Little Boy asked what it meant. Before I could figure out how to explain it well, he said "I know! It means don't put fire on people." Good thinking, Little Boy. Don't say you didn't learn anything useful when you were three.