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

Guessing-game dialogue about one of the objects:
q: Is it a person?
a: No
q: Is it a tree?
a: No
q: Is it a skateboard?
a: No
q: Is it clothing?
a: No
q: Is it a building or part of a building?
a: No
q: Is it a shadow?
a: No
q: Is someone wearing or holding it?
a: Yes
q: Is it a backpack?
a: Yes
q: Is it the black backpack worn by the guy in red on the right?
a: No
q: Is it the red backpack worn by the guy in white on the right?
a: Yes
q: Having fun with this hit?
a: Yes