Objects in the image:
category: backpack
category: skateboard
category: person

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it a skateboard?
a: No
q: is it on a person?
a: No
q: is it that pile of stuff in the back?
a: Yes
q: is it a particular item?
a: No