Near the end of Haskell Wexler's 1969 film "Medium Cool" are several scenes shot in 1968 in the streets of Chicago, during the Democratic Convention. It's actual footage of Chicago police trying to stop a procession of peaceful demonstrators making their way to the Convention center. In one scene there's a line of cops with riot shields, facing the oncoming demonstrators.

The camera is near the cops, looking at them, when suddenly a tear-gas canister is thrown and lands a couple of feet in front of the camera so that the gas blows towards it. Someone, presumably the cameraman, coughs. A second later somebody close by exclaims (probably to the cameraman), "Look out Haskell, it's real!"

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