Composing these types of greetings are fun, but they aren’t applicable for some situations. You may make a funny voicemail greeting for your own personal voicemail box. However, it’s not appropriate for professional or business phones. Here are some humorous examples for you: You have reached [mention your name].
You have reached the , Strategic Air Command Nuclear Missile Storage Facility. We are unable to come to the phone right now. At the tone, please leave your name, number and target or list of targets and we’ll launch as soon as we can. And have a nice day.

You might also consider giving them the option to skip your voicemail message completely by pressing another key (again, check with IT). You also want to make callers aware what you will return their call, instead of telling them that you will try to return their call--and let them know when you are likely to do it, if possible. If necessary, provide additional or emergency information in your voicemail greetings. My dentist, for example, lists his cell phone number for emergencies.
Your phone system can be a powerful marketing tool for your business, and that includes your voicemail greeting. If you want to utilize this opportunity to throw in a quick humblebrag and keep callers informed of your awards and accolades, there are a few best practices, you should follow. First, keep the self-promotion brief and appropriately placed within your voicemail message. Don’t promote yourself and your products/services in the same greeting, and finally, only include current achievements in your business voicemail greeting.