Even if this explanation is accurate (i.e., the clip originated as a message left on a Jack in the Box employee’s voicemail), it doesn’t preclude the possibility that the accident described never took place, and the recording was just a prank one employee pulled on a co-worker.
Made famous by George Costanza as you can see the clip here, the answering machine song may seem like a good idea. It's out of the box, unexpected, and definitely a novelty, but unless you're in the music business, it's probably not a good idea. You'll definitely irritate your mother (or anyone else important who calls you frequently) and you won't make a good first impression with your message.

You can’t always get to the phone when clients, partners, investors, or colleagues call you. When this happens, a professional voicemail greeting helps you make a positive impression and tells them what to do next. There are a variety of ways to convey your message. If you’re not sure what type of message to record for your own voicemail box, here’s a definitive guide to get you started.
Using poems, rhymes, or creating rap songs is another way to leave funny voicemail messages. Twisting any popular poem or rapping an altered nursery rhyme can be a fun way to stamp your personality on a voicemail, for example, "Now I lay me down to sleep — please leave your SOS at the beep" or "Roses are red, violets are blue, if you leave a message, I'll ..." Is Amazon actually giving you the best price? This little known plugin reveals the answer.