Just recently I preached at a friends church and she asked me to make my sermon relevant to bullying. I used several examples of my own, plus found many examples from the Bible.
The result: A man who was never able to even begin to come to terms with what had happened to him as a child is now ready to face his demons. What an awesome tribute.
You never know who needs to hear your message. Don't be afraid to speak up. You might just be the person someone needs to hear that day.