Ahahaha! That's hilarious! Kids come out with the funniest things. My little sister when she was three, about two years ago, started to screech in the car. I asked what the problem was. She said there was a bug on her knee. I said, just brush it off. There was a beat of silence and then, in a really sulky voice, she replied, "I don't have a brush." I swear, I couldn't stop laughing for at least a mile!
That's awesome! And smart, too--I'm always impressed by how kids get those things (taking phrases literally is, in many ways, the best way to go!). :)