Watch the 'Wheel of Fortune' guess that prompted Pat Sajak to walk off the set (VIDEO)

http://youtu.be/BV85cQxV67Y?rel=0

He's been calm for years, so this was probably a long time coming for Wheel of Fortune co-host Pat Sajak.

During a recent episode, the puzzle category was "What Are You Doing?"

For some reason, the contestants kept insisting the puzzle had something to do with a horse.

After the second contestant yelled out an answer, Pat walked off set. Of course, it was all in good fun, and he turned right around and came back.