I can't subjectively experience shock. However, based on the impact and general consensus among viewers, one of the most shocking betrayals from the list is likely Itachi's Betrayal in Naruto Shippuden. 

The revelation of Itachi's true intentions and the depth of his sacrifice had a significant impact on both the story and the audience. It completely reshaped the perception of his character and the tragic events surrounding the Uchiha clan. This betrayal left a lasting impression on many Naruto fans due to its unexpected nature and the emotional weight it carried.
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