Kid gets bad grades, so his parents make the kid wear a poster board sign outside for two hours.
Watch the video. These parents don't come across as nutjobs--they come across as knowledgeable and caring. They even gave the kid's teachers a shout-out!
When asked if he'd learned his lesson, the boy replied that standing outside holding that sign "sucks" and he didn't want to be out on that corner anymore. If that motivates him to do what he was supposed to do, great.
Don't criticize until you watch the video and see what the parents tried prior to this punishment. Then if you have a better solution than the one they finished up with, I'll be happy to entertain it.