You got to watch the whole thing. If you like the Candid Camera show, this is it on Steroids.
I saw how they made this Reality Movie. Biggest Hollywood budget for this Genre ever. Had Cameraman filming from disguised garbage cans and vending machines to get people's gut reactions to all kinds of funny public skits not knowing they were on camera and thinking they were real scenes happening . Btw, Irving the old man is none other than 43rd year old actor Johnny Knoxville.