Three years ago, I made a big mistake. I used the neighbor's White Galloway (beef) semen on one of my Holstein cows (they keep their semen in our tank). I named the heifer that was born Britney Spears, for her signature song "Oops I did it again" since I used all of their semen.
Today, Britney had her calf, and although she is only 1/4 White Galloway, she looks purebred and is a pretty little thing. I call her Little Brit and am so glad Britney had a heifer. Sometimes mistakes aren't the worst thing (although I felt terrible when I realized what I had done!)