The most effective public-service ads are both funny and though-provoking - like this new one from the British government's "Think!" campaign.
It features a sober-looking man who talks about how his body is still over the limit the day after an evening of drinking, miming to his own drunken voice that he had recorded the night before.
The man says:
"The voice you're hearing is mine; it was recorded last night, after I had a few pints…because alcohol takes so long to pass through my body, even though I feel sober now, my body is still drunk."
In the advert - the first to deliberately use a drunk presenter - he struggles to mime to his slurred voice, at times looking comically embarrassed as his voice stumbles, rambles and giggles.
The 45-second video ends on the tagline:
"To your body, the morning after is still the night before."
The message is clear; if you are going to drink, don't even consider driving, and think very carefully about whether you are really safe to drive in the morning. It can have devastating effects on your life and those of other people.