Objects in the image:
category: person
category: boat
category: surfboard
category: person
category: surfboard
category: person

Guessing-game dialogue about one of the objects:
q: is it a person?
a: No
q: is it the boat?
a: No
q: the water itself?
a: No
q: something in the boat?
a: No
q: something these people are using?
a: Yes