Sorry I have to tell you this story although it will put you off PYO strawberries for life.
A couple of friends took their son (nearly 3) strawberry picking the other day. Son decided to go and see his mother who was at the other end of the field and trotted off up there. Dad looked up to see his son half way up the field with his trousers around his ankles having a poo on a clump of strawberries! He shouted at him which obviously caused everyone else to stand up and look at him. Whilst dad was running up the field towards him, son finished his poo stood up and started watering the strawberries! When he saw his dad coming, he simply laughed and ran off leaving his pants and trousers behind.
They made a very quick exit