In the days before caller-ID, we found a co-worker's home phone number. We called it, and timed how long until the end of the voicemail greeting/beep. Using that timing as a guide, we'd call his home number while he was at work, then as it got to the end of the greeting we forwarded the call to him at his desk. We did this all day long. When he got home and checked his messages, 21 of them were of him answering his work phone in a progressively angrier manner.
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In the days before caller-ID, we found a co-worker's home phone number. We called it, and timed how long until the end of the voicemail greeting/beep. Using that timing as a guide, we'd call his home number while he was at work, then as it got to the end of the greeting we forwarded the call to him at his desk. We did this all day long. When he got home and checked his messages, 21 of them were of him answering his work phone in a progressively angrier manner.