Public service announcements (PSA)

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I'm sure all of you have seen at least one PSA, if you don't know what a PSA is, its those commercials you see on TV that tries to resolve something in or to persuade people. For example, the kids help phone PSAs, or the stay fit PSAs. I need an idea for PSAs for school, any ideas at all, but preferably on violence, drug abuse, friendship and bullying. Thanks.