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."
Hi, you have reached the Borg collective. Please leave your name and star system and we'll assimilate you as soon as we can.

Keep in mind that regulations for use of email and text messaging may require clients to opt-in—meaning they give permission for you to contact them in this way. So, you’ll need to be clear if you plan only to use email or text messages for one-on-one communication during active casework or if you may also use it for other reasons as well, including reminders or promotions for your products or services.
Your voicemail greeting can make a positive or negative impression on people. By considering your target audience and tone, you should be able to keep it positive. Length: Don’t make people wait minutes to leave a message. Apologies: If people expect your to be available, apologize for missing their call. Set expectations: Let people know when they may receive a callback, but be realistic. Accuracy: If you change your voicemail for things like holidays, be sure to update it when needed. How do You Set Up a Business Voicemail?