It gets worse when the parked truck's brake loosens and the truck rolls into a curb, knocking the rest of the barrels loose, which roll downhill as well — directly toward the Stooges, who are eventually pushed into a freshly laid sidewalk of wet cement.
When a parked truck's brakes fail and it rolls into a curb, it causes other barrels to become loose and tumble downhill. These barrels then roll straight toward the Stooges, who are subsequently pushed onto a newly constructed wet cement sidewalk.