This idea is genius...

   

I've seen a lot of stuff that's made me say, I wish I had thought of that.  But this one is near the top.  A group that helps neo-Nazi extremists get out of that lifestyle went to an event and handed out free tshirts.  People snatched them up and enjoyed them, but as soon as you wash it an anti extremist message comes up and offers a way out of that life.  Now I'm sure people didn't run out and call immediately, but when they do feel like they need help they now know who to talk to.  Pretty sweet idea.