My next door neighbor was a few years older than me and was constantly showing me all kinds of nefarious stuff. One thing he showed me was if you tape over the tab on cassettes, you can erase and re-record what you want on them.

One time my older sister and I got into a fight and to get back at her, I erased side A of her Michael Jackson's Thriller cassette she had just gotten a few weeks prior. She got it replaced at the music store and the salesperson was completely befuddled by the entire situation. That one day the music was there and the next day just gone? Inconceivable!

I just played stupid at the time, but felt like a god knowing that little trick. So, sorry sis. But John C, you were the man.