Record it on DVD, then hide it in a Chinese puzzle box, which is buried behind a secret panel in the wall of a mansion, which can only be found after solving a fiendish substitution cipher, that is assembled from a scavenger hunt of letters, that the family will be guided to, by your lawyer sending out letters and emails, at the rate of one per day, for a year.
I want the breathtakingly-perfect worldwide audio system that the Vogons used to announce their demolition of the earth. What I would say would be a mystery until the moment.
I probably would have recommended appearing to your family as an apparition to deliver the message, but looking at how well that worked out for Hamlet’s family…
I’ve always been kind of spooked by those recordings that begin with the person looking into the camera and saying something along the lines of By the time you see this, I will be dead. Like the public awareness message Yul Brynner made about smoking and lung cancer (which he died of).
I think if I was a Star ship Captain and needed to provide secret destruction codes or something then I would do this. Since I’m not, I can’t even imagine bringing myself to do this. I’d much rather smile in person, say I love you, and then perish. Hopefully while in fairly decent health and not a bed-ridden vegetable.
Naw, I’d probably just do something boring and tell my family I love them, and when they die to bring pie. (Oh no, two tired SDMB cliches in one post!)
Oh, and GorillaMan, I lol’d. (now a 4chan meme. Somebody alert the internet police!)