typical 4 year old boy response

conversation between one of rory's friends (who is a 4 year old boy, as the title of this post might suggest) and a well meaning adult:

well meaning adult: what are you going to be for halloween this year?
boy: a giant piece of poop.

there is presently a lot of scatalogical talk of the 4 and 7 year old variety going on in that household, according to the mom.