It happens to all of us. Sometimes the words in your brain, or on paper before your eyes, don't come out of your mouth in the way you intended, or in the order right.
It happened to my Radio Wales colleague Peter Johnson, an experienced and immaculate broadcaster, who yesterday revealed to Sunday Edition listeners the existence of a scary new disease called "bluetooth".
I think he meant bluetongue, although perhaps he didn't.
Symptoms of bluetooth disease include unsightly growths in one ear, a tendency to shout usually found only in those who are hard of hearing, and a propensity to drive white vans or Mondeos as vehicles of choice.
Scientists have had diseases named after them for less. Peter, take a bow.