Context does matter here. If the caller would reasonably expect you to answer the phone (such as if they were calling a store or other place of business), an apology for not being able to get to the phone makes the most sense.
Hi, you have reached (names) voicemail. If you want money or to sell us something, we a) gave at the office, b) already have it, or c) don’t want it. If you are a friend, trying to give us money or just want to talk, then leave a message or try my cell phone number.

If you’re looking for funny voicemail messages to leave on your answering machine or cell phone, then here’s some of the best examples to try. We had a contest to find the most hilarious voicemail messages to make us laugh and thought you might want to try a couple out yourself.
Humor also leaves a lot of room for misinterpretation—which subsequently weakens sincerity and authority. A caller can be very turned off by merely misinterpreting your joke. Why take this risk? Additionally, this could even cause callers to question your character. Say, for example, the president of a company’s mobile phone voicemail greeting was funny. What’s to happen if the caller didn’t like or get the joke? What if they found it offensive? Another scenario is that a caller is reaching out to you for the first time—i.e. they have no idea regarding your personality. What next? The point is, with this type of greeting, humor is bound to be more divisive so just avoid it altogether. c. Poorly Pacing Your Message and Bad Time Management: Don’t speed through your message. Speak clearly so callers know what to include in their message and when to leave the message. At the same time, don’t drag your message out. No one wants to sit through a diatribe. Just get to the point clearly.