This is considered "Jamming". If by any chance you need to jam a phone line this is how you do it, with a clip. Pick up the phone. Rip the buttons off. Take 10 paperclips and bend it where it is "pointing" up. Carefully glue the paperclips facing up. Hang the phone up.
When the target goes to place the call 3 things could happen.
1. He gets poked and starts crying.
2. He get electricuted.
3. Both
Here is another use for paperclips
If you are ever getting pursued by the police, bend the paperclips facing up like in the previous example. Then huck all of them out the back window. It will pop their tires.