This is cool, kudos to the kid.

In one of the most heartwarming scenes you'll ever see, a young Arizona Diamondbacks fan named Ian made Wednesday's play of the day at Chase Field after an even younger fan named Nicholas missed a ball thrown his way by Milwaukee Brewers second baseman Rickie Weeks.
Video in the link.

Play of the day! Selfless young fan returns ball to upset boy - Big League Stew - MLB*Blog - Yahoo! Sports