Informal voicemail greetings are those that don’t adhere to the rules of professional and business voicemail greetings. Here, you are free to just leave a simple greeting, or use it to show your more witty side. This style of greetings can be used for both home and business if you like, depending on the type of caller you expect. For instance, a novelty shop could probably create a rather informal message, using sound effects that represent the type of items they sell.
“Is it displacing phone calls? Not to any significant degree. I was just in a practice yesterday that has 30 incoming phone lines and cannot keep up with the call volume with four receptionists on at all times.”

Hello, this is Sally's microwave. Her answering machine just eloped with her tape deck, so I'm stuck taking her calls. Say, if you want anything cooked while you leave your message, just hold it up to the phone.
No19: I can't come to the phone right now because I'm down in the basement printing up a fresh new batch of twenty dollar bills. If you need any money, or if you just want to check out my handiwork, please leave your name, number, and how much cash you need after the tone. If you're from the Department of the Treasury, please ignore this message.