Your voicemail should be very specific. It should be short and urgent. Use word's like "need", "should", "must" , or "have to" to create a sense of urgency. For example, say something like, "We need to discuss..." or "We should talk about..."
Random facts could include their favorite movie, vacation spot, candy, or television show. Regardless of what you choose, it will surprise your caller and more than likely make them leave a message if they were considering hanging up.

“Hi, you’ve reached [your name]. I’m away from[date] to [date]. If you need help with [X] before then, please contact [name] at [phone number]. Everyone else, please leave your name and number and I’ll return your call when I return. Thanks and have a great day.” “Hello, you’ve reached [your name]. I’m currently [exploring Asia, hiking through the jungle in Costa Rica, hanging out on the beach in Bermuda] — or more likely, [recovering from extreme jet lag, googling ‘Are red spiders poisonous,’ or looking for SPF 150 sunscreen] and won’t be back in the office until [date]. Leave your contact info and reason for calling and I’ll get in touch then.” “Hey there, this is [your name] from [your company]. I’m out of the office until [date]. In the meantime, please direct your inquiries to [coworker’s name] at [email address]. [He, she] can also be reached at [phone number]. Thank you.”
3. 4 out of 5 people who employ this service have country music as their song of choice while I wait to be connected. It’s as if country music fans got together and said, “if only we could get 15 seconds of our music into people’s ears, they would see how amazing it is. Does anyone have a bright idea of how we could force people to listen to 15 seconds of country music?”