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

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it on a person?
a: No
q: is it the ramp?
a: No
q: is it on the wall?
a: No
q: is it a lamp?
a: No
q: is it on the ground?
a: No
q: is it a banner?
a: No
q: is it a bench?
a: No
q: is it a board?
a: Yes
q: then it's on the person. the board used by the person with helmet?
a: Yes