This is probably all-over-everywhere by now.. but this made me laugh out loud. Follow this link Jack in the box Voicemail
for an introduction and a link to an mp3 [4MB, 3.5 minutes] of an apparently genuine voicemail message...
"...when an operations manager was late for a meeting and called his boss to tell him he was running late. As he was leaving the voice mail message, he witnessed an accident and went on to provide "play by play" of the incident."The Urban Legends Reference Pages considers this "Status: Undetermined" - and their investigation hasn't proved it to be a hoax (yet), see:
http://www.snopes.com/autos/mishaps/beating.asp
