B: Top-soil!!!???? We already have top-soil, we bought two of them in Mexico [he means the spinning tops we bought back from Mexico for the kids.]
Me: No, I don't mean tops, I mean top-soil, which is a kind of dirt. You put it on your grass.
B: Top-soil's not a top???!!! That's funny. What colour is it?
Me: It's black. It looks like dirt.
B: That's funny!!! What flavour is it?