A clever, witty voicemail message can be short or long, complex or simple, as long as it is entertaining. Using famous lines from TV shows or movies is a great place to start. There is a lot of creative wordplay that you can use based on famous lines from classics like The Twilight Zone. For instance, you could say, "Hello, you've reached the Twilight Phone, where every message is sent into another dimension. To receive an interdimensional call, just leave your name and number, and I'll call you from the closest parallel universe."
The hiring manager loved your error-free application, and really liked the initiative you showed when you came in to follow up on your application. They have a really good feeling about you and are looking forward to having you come in to interview for the position. There’s even talk about hiring you on the spot! So, the manger dials your number and…ring….ring….ring…”We’re sorry, the voicemail box you are trying to reach is full. Please try again later.” The manager starts to think that you aren’t taking this very seriously and moves on to the rest of the applications, as there isn’t any time to waste with this job needing to be filled quickly.

My wife and I can’t come to the phone right now, but if you’ll leave your name and number we’ll get back to you as soon as we’re finished.
A great way to incorporate a fun voicemail greeting in today’s age is re-writing the lyrics to a current billboard topping hit. Ellen DeGeneres did just that when she asked Adele for a little favor; to sing a little ditty inspired by the number one song, “Hello.”