[lmm]

I sent these out with my international wedding invitations (in Japan it's normal to include a stamped reply postcard). Had to go around several large post offices to get enough (indeed I thought they must've stopped making them and only be selling leftover stock, although the wikipedia page and Japan Post website suggest otherwise).

Felt like a fun old-timey experience, like sending a telegram or postal order. Most of my relatives apparently couldn't work them out though, even though I included detailed instructions.

[WillAdams]

Similarly, bought one to include with the wedding invitation which we sent to the Pope and got a very nice note back.

Additionally, my best man sent my father-in-law the traditional congratulatory telegram, which they "delivered" by calling him on the phone and reciting it, then mailing the physical telegram.

(apparently I'm old, at least that's what my son who was born in January 2000 keeps saying)