My childhood memories are filled with public service announcements. Whether it was Darth Vader serving penance as the Green Cross Man, or warnings not to mix cross-ply and radial tyres, each film sent a carefully-constructed message.
Looking back, many of the old PSA's were dated and laughable, especially for a modern audience. Times have changed, and so have PSA's: here in the UK we have a very effective anti-drink drive advert that has run for a few years.
It is rare for such po-faced adverts to become an Internet hit. But one has: here is the brilliant PSA 'Dumb Ways to Die'. With mind worm lyrics, a catchy tune and simple Mr Men-style graphics, it is both cute and weirdly disturbing.
I won't say what it's message is, but needless to say it is very effective.