NEVER THROW ANYTHING FROM A MOVING CAR
From the 1934 Wills Cigarettes 'Safety First' album.
"Never throw anything from a moving car. Careless picnic parties are responsible for many restrictions. If a convenient receptacle is not close at hand, bury all rubbish or take it home and burn it. Never, on any account, throw anything from a moving car, for in addition to the force of the throw, it has momentum by virtue of the speed of the vehicle, and may cause serious injury. Even if the article is so light that it will not hurt anybody, it may distract attention of another driver and so be the indirect cause of an accident."