I wasn't arguing against the tattoo! It sounds like a good idea, and more likely to be seen than the card. (However, you should get the card and then plot the tattoo. A being on the local database and having your wishes known by your next-of-kin is your best bet to being effective in donating).
Yes, but I would rather suffer the small embarrassment of having the card with me on the beach than the pain of multiple tattoos, plus having to listen to my other-than-next-of-kin relatives' sighs and moans if they see the ones on appendages etc. (I have not had a single one yet, but I assume there is pain involved.)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.