What was the matter with the boy?

W: What happened?
M: Well, I was lying in the sand enjoying the music on the radio, when suddenly I heard someone shouting for help so I jumped up and saw a little boy waving his arms in seawater. I took off my shirt and my watch and jumped into the water. I brought him back.
W: Was there any body else around?
M: No. Not at that moment.
W: Where were his parents?
M: They were away buying some drinks.