This guy was stuck behind some shelves in my dad's garage:
What a dumb bird.
Anyways, I do have a pension for zoology and know that throwing bread and berries in a box is not ideal feeding for a juvenile sparrow. I'm not as naive as I was in Canada at age 4 when we found an injured pigeon (by a cat) and tried to nurse it back to health, only to fail miserably before it died from a combination of starvation and being left outside in the cold. My biggest contribution then was to draw a bird's foot and cut it out with scissors to place in its box so it would have a place to put its foot. Remember, I was 4.
If it survives the night, I think I might take it to a wildlife reserve nearby. My level of compassion will depend on how hungry I am.