The U.S. Mail

"When you're out of correspondence envelopes, or don't want to buy any, you can mail the paper you wrote on. Write only on one side, fold the paper in thirds, and seal the open edges with any sort of tape. Then you address and stamp the outside surface, and the Post Office will accept it for first class mailing.

"You can get by without stamps, too, for in-town mailings. Just reverse the positions of your friend's address and your own return address, and omit the stamp. Then the mailman will return the letter to your friend for postage. Next, a big paddy-wagon will drive up and take you away to the federal pokey, for defrauding the U.S. mails. Thus, you've saved five cents, plus board and room for the next twenty years."
The I Hate to Housekeep Book, by Peg Bracken, page 87-88

This doesn't have anything to do with anything, really, it just made me laugh.