The funniest part of this concept, to me, would be sending an email this way and knowing that after it self-destructs the recipient would be searching and searching for it ... cruel perhaps, but so funny.
Good for an April Fools day joke or if you made a bet and emailed someone "documentation" of said bet, then lost - you could always say you have no idea what they are talking about - prove it, show me!!!


Your mission, should you choose to accept