You know those little mini-billboards that face you from the end of your shopping cart, alerting you to some new thing from Nabisco or P&G? I hate those things. The ones I like are the graphical PSAs with no words and simple instructions, like this one.
The message here is "Don't be a bad mommy. Your child should not be allowed to dance inside the shopping cart while you wander off, looking like a woman who really resents that deadbeat who got you pregnant three years ago, as you wave off the screaming reminder of your ill-advised night of passion, who wants some sugary goodness from General Mills that he saw on the Cartoon Network, which acts as your all-day babysitter."