When I was a kid the worst one I ever made was as follows: My voice had not changed, and I called the mother of a 5 year old (whose older brother was my age --11) snd pretended to be the mother of one of the little kid's friends. I invited him to come to a birthday party the following saturday. The little kid showed up all dressed, with a present, etc., and NO PARTY. Somehow I got caught. Spend a month in my roomas punishment and my ass still hurts from the spanking!