a fools message

When you call somebody, and their answering machine comes on. However, you think the person picked up the phone so you start talking and telling whatever the reason is your calling. Seconds later you realize the other person is talking too and you just heard a beep, but you've already talked half the tape full and you screw up the other half by trying to explain what happened...

Also leaving a message that completely misses the point, and doesn't contain the reason you called or your name could be considered a fools message.