This happened to me once. I got grounded for a month.
Ahh, fond childhood memories. This reminds me of the times when My brother and I were left home alone after school, hours of unsupervised fun. We would often come home, stressed out from our hellish day at the laboratory (I'm not kidding our schools were actually labeled as laboratories...) And we discovered the best way to alleviate our stresses was to seek cheap thrills by randomly calling strangers and unleashing all manner of verbal abuses that 6 & 7 year old monsters were capable of. Keep in mind this was way before caller I.D. so we pretty much got away with it, well, almost. I remember us getting one of those "are your parents home?" calls and we took turns pretending that our mother had just walked in and started beating the crap out of us, we were screaming and crying and throwing the phone book down next to the phone and just coming up with all kinds of bloody murder before hanging up. The next day was fateful. We were chowing down on twinkies and ding dongs while watching tom and jerry when of all things this absurd "commercial" interrupted our beloved cartoon peddling cheap jewelry that contained diamond .."elds?" and then they did it. They flashed the phone number and all our sugar fueled rage could grasp at that age was some stupid robot was about to get the business. And they did. We called them up and with a cute little nursery rhyme "The gold is made of brass, the diamonds are made of glass, and my middle finger is going up your @$$" *click* Every time that commercial would air, we would call, and chant. Unknown to us, someone was filing complaints. MANY someone's actually...They tracked down our number and managed to tie us into -all- the harassing phone calls we had been making. Our mother gets home one day, all red in the face and we soon learned the folly of our ways. Good times!