In the movie Magnolia, the cop's gun is stolen (I think by that kid who raps). After the rain of frogs, the gun falls to the ground too. Where does the gun come from?
The gun is picked up by Dixon, and later thrown off a moving car. If the car was going over a bridge, it'd certainly explain how it landed there. This later scene is only in the script, not in the movie.
Worm's car drives down the street. LONG LENS. ANGLE, at the car, Dixon leans up and out the window a bit....he's got the gun wrapped in newspaper, taking the fingerprints from the gun....he throws the POLICE ISSUED WEAPON from the speeding car...
Some would argue it is providence, given the frogs, but ultimately an explanation is never provided.
According to Stanley Spector (Jeremy Blackman), the browbeaten child prodigy unhappily competing as a What Do Kids Know? contestant, it's just something that happens:
The film has an underlying theme of unexplained events, taken from the 1920s and 1930s works of Charles Fort, an American writer and researcher who specialized in anomalous phenomena. One of Fort's books is visible [in the film] ... and the movie's end credits thank Charles Fort.