Weird messages on answering machine?

I guess anyone that has an answering machine has gotten a weird message left on theirs at least one time or another.  I don't know if they did it on purpose or if it was just an accident but it was a very weird message!  There was a lot of background noise and other peoples' voices could be heard in the background and to tell you the truth I couldn't even understand what the person was trying to say.  They probably don't even know that they dialed the wrong number.