I posted this a few years ago but it's still a funny story.
Back in the late 1960s, a friend and her DF were planning their Wedding and were a bit strapped for cash. They may have been listening to a bit too much Elvis Presley or they may not have been too bright but they came up with a brilliant idea. They could send out their invitations and get their response cards back with out spending a penny on postage.
They put the addresses of their guests in the return address space and the address of the Bride in the space where the address would go. They did the same thing with the envelopes for the response cards. When this was done, all 200 invitations were dumped into a single mailbox in a very small town.
They had neglected to consider that the town postmaster was invited to the Wedding.
A few days later, the entire bale of invitations was left on the doorstep of the Bride with a note that read, 'Nice try.'