Or if you have children who like to peek at their presents early. I did this as a child one year, I slit the tape on every one of my presents, peeked, and re-taped. Then I had to wait and wait and wait for Christmas Day, and then I had to act surprised and happy. It was the worst Christmas of my life. I told my children of my experience and so far, have not had one problem with them being snoopy! :)