My mom once opened a personal letter of mine from a girl who was writing me from bootcamp. She claimed she didn't read it, but it reallllly pissed me off. The next day I just opened all her mail and said the same thing she did "It came to the house and I was home and you weren't! I didn't think you'd get so pissed about it!" We got in a really big argument and she hasn't opened my mail since, including my mail-order buds.