Conversation with a 4-year-old

-Driving home-

Mae: Why do people have cars? Why don't they just have strollers with a lot of seats?
Claire: Well, who would have to push that stroller?
Mae: It would have a steering wheel and an engine.
Claire: Ok. Well, cars make more sense, because they are safer. They have this strong roof that can protect you if you crash.
Mae: Well, this stroller would have a roof.
Claire: This stroller is sounding a lot like a car.
(beat)
Mae: But... it's a stroller.
Claire: Ok, ok, but how is it different than a car?
Mae: It's green.