Most voicemail systems give the option of pushing # or just hanging up. I haven't found one that ignores you if you DON'T push #. Pushing # usually gives you other options, although I've never tried it actually. What options do I need at that point?
"Press 1 because you realized what you just said is stupid and embarassing, and you want it deleted. It won't really be deleted but will be saved to a special voicemail box called Future Blackmail Fodder...Press 2 because you believe the message you just left is more important than any other...Press 3 if you want to hear, "Stay Out Of the Damned Lakes"...otherwise just hang up because we've frankly heard enough from you already...."