We're spoiling the ending for your own good!

Spoiler warning
The article contains spoilers for the Monk episode Mr Monk and girl who cried wolf. You may not want to read this if you've not seen it.

Just before tonight's episode of Monk (on Hallmark), the announcer warned viewers that a man covered in blood would appear at various points throughout the show. That's fair enough, but the announcer then reassured us all that "he's only playing a joke on Sharona".

The episode itself covers Sharona gradually losing her sanity and we're not meant to know - as viewers - if this man is real or an hallucination, until the big reveal at the end.

I'm all for warning people that they may find some shows upsetting, but giving away the ending like that seems unnecessary. I already know that both Sharona and the man-in-blood are in reality both actors.