A couple of years ago we noticed strawberry plants growing in our flower beds, under the flowering crabapple tree. This was strange primarily because we had not planted any strawberry plants.
Later that summer we were talking to our neighbor, Mike, who is a junior high science teacher. He noted that he had strawberries in his yard (two houses away). They were delicious when they weren't totally bird pecked.
We thought about the birds who liked to perch in that particular tree and, well, put two and two together. Despite their unappetizing beginnings, we sure enjoy the strawberries.