Nothing like a five-year-old boy

Ben: I was running at school so fast!  

Me: Really.

Ben: Yeah, you know when you run so fast and smoke comes out the back of your shoes?

Me: Yes, that IS fast.

Ben: All my friends behind me were coughing and coughing because of all the smoke.

Me: Oh, my.  You are a fast runner.

Ben: Yeah, really fast.