I got this from my friend, but thought it was a great message.

You know that girl you called fat? She's starving herself. That man you stole that pouch from? He's homeless. That girl you shoved? She gets beaten enough at home. That boy you made fun of for crying? His mother is dying. Post this on your profile if you're against bullying. I bet 97% of you won't, but the 3% who have the time and heart will.