ldopa.net

Who needs the “Forever” stamp when you’ve got this handy tip:

1. Write the name of the person you want the letter to go to in the return address, where you’d normally put your address.
2. Write your address front and center, where you’d normally put the recipient’s address.
3. Casually “forget” the stamp.
4. Your letter will be “returned” to the recipient and you, my friend, will have 42 additional cents in your pocket. Go nuts!

~jeff

NOTE: as pointed out (so obnoxiously) in the comments, this is only likely to work if you live in the same state as the recipient.

ALSO NOTE: this is probably illegal.