Voicemail greetings are not memorable. Most of them are exactly the same and therefore, provide no surprise to the person on the other end of the line. When people see, hear and experience the expected, they tend to forget it very quickly. Funny voicemail greetings give your callers a sense of shock. That shock is not easily forgotten. Not only will this encourage sharing and engagement (which I will get to later), but it will also give you a distinct advantage when you return the call.
Now, here's where the embedded commands begin. I don't know if you've ever heard of Neurolinguistic Programming, NLP. I'm no Ninja at it, but I've learned a little bit about it through the years and if you can embed commands that aren't direct commands, not explicit, I'm commanding you to do this, but a subtle statement of a thing that embeds as a command to your subconscious mind, it can have an influencing effect on the other person.

You are using an out of date browser. It may not display this or other websites correctly. What's the funniest/coolest/cleverest/favorite Answering Machine/Voicemail/Answerphone Messages you've heard, or even done yourself? In college my roomate was a cop, he told me that the worst things you can say on an answering machine were 1) telling them your name, 2) telling the caller your number, 3) and that you aren't at home. Well, here's what I did...
After creating, the Voicemail Greeting, you can test it by calling to your number from another phone, and see if it is playing correctly or not. Open the Phone App. On the lower screen, tap on the Voicemail option. Select Custom, with this option, you can record the personal voicemail greeting on the iPhone. Tap Record, to start recording the voicemail greeting message on the iPhone. Greeting samples are given in this article below, Once you are done with recording, tap Play to listen. Lastly, if everything is alright, and custom voicemail recording is perfect, then tap Save.