A friend of mine used to have one of those carriers where you would leave the greeting, and then the prerecorded voice would say, “please leave a message after the tone.” So his message was, “Hi, I can’t take your call right now, but if you hold on one minute, my secretary will take a message.”
My voicemail used to say “Please leave a message after the yell….
YAAAAAAAHHHHHH!!!!!”
You can substitute other sound effects as well, like “Please leave a message after the crunch” or “the yodel” or “the breaking glass.”