1) got a talking too about performance - it wasn't called a pip (my mom was dying and I was taking too much time out for medical appointments for her. Note the discussion was shortly after she had passed)
2) As a fairly new manager (at the time) I had to put my first hire as a manager onto a pip. It was painfully obvious to everyone they were not capable and struggled with the most basic things.
While I didn't hold out much hope they would turn it around, I gave them every opportunity to prove to me they could do the job (or learn at least to) they were hired to do, instead they cheated their way through the pip, passing others peoples work off as their own.