A friend of mine shared this video with me this morning. It's a brilliant, simple way to a) get rid of junk mail, b) show credit card companies and big banks that you don't appreciate all the trees they're killing to flood your mailbox with crap, c) support the USPS and most importantly d) occupy Wall Street's time.
As the video describes, it only entails a few simple steps:
1) open you mailbox, sort out all the credit card offers
2) open up all the credit card offers
3) put all sorts of shit in the return envelopes provided
4) mail it back free-of-charge
Enjoy!