Weird call...was over weekend, so a message was left.  It was an automated system that went on for 3 1/2 minutes, telling jokes.  During the message, it would ask you if you wanted another joke, if not, to hang up.  After the 3 1/2 minutes, it ended the call.  Can't seem to find anything else on the internet that says what the purpose of this call might have been.  Very strange.