Do you mean that person hisses onto the answering maschine? Or do you pick up, say hell and then they hiss and disconnect? Either way here's my way of dealing with someone who phones repeatedly but doesn't talk: when it rings, pick up the phone, but don't say anything. Just wait with the phone near your ear (and away from your mouth and nose) for a minute or two and see what happens. Whether it's a junior prankster or someone with a legitimate reason to call you (but technically inept), they will eventually start talking just to find out what happened to the connection. It doesn't work on everyone, but I got several little phone pranksters to stop annoying me this way.
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