One shoe

A kid's shoe on the curb. Only one when they are generally worn in pairs.

How did it get there? There must be a story behind this.

Dropped from a stroller passing by on the sidewalk? While the size is small, it seems a little too large for someone who would be sitting in the stroller.

Maybe tossed from the backseat of their family vehicle in a tussle with their sibling? Parent or parents in the front seat unaware of what just happened?

And when they arrive at their destination, how come you only have one shoe?