Best I can do...not sure there's the whole episode available to link...east coast time here....
So maybe those farther west can watch as it airs...and maybe someone more adept than me can figure out how to link...
Dateline NBC
Airdate: 09/02/12
A hidden-camera report on children's behavior when confronted by strangers. Correspondent: Natalie Morales.
I believe this is a repeat - at least they aired something similar a few months ago.