I actually spanked my son once and it was the last resort. He kept banging his head on the plate glass window and watching it vibrate. I tried everything! He was too young to reason with. I blocked it off with a table. He found a chair. He'd even wait until I was out of sight to start doing it again. I was desperate. It was his first spanking. I dreaded it but it was for his personal safety. I still remember it in slow motion. He never banged his head again.