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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is person holding it?
a: Yes
q: guitar ??
a: No
q: skateboard ??
a: Yes
q: guy in a middle of the picture holding it in the air?
a: No
q: guy next to him?
a: Yes