What three actions does Shonagon offer as proof that Masahiro really is a laughing-stock?

You are likely referring to the character of Masahiro from Sei Shōnagon's famous work "The Pillow Book." However, Shōnagon doesn't explicitly list three actions as proof that Masahiro is a laughingstock. Instead, she uses a more nuanced approach, painting a portrait of him through various anecdotes and observations.

Here are three examples from "The Pillow Book" that illustrate Shōnagon's view of Masahiro:

1. His overly formal manner: Shōnagon describes Masahiro as being very formal and stiff, even in casual settings. For example, she mentions that he uses excessively polite language even when talking to close friends, making him appear awkward and out of touch. This formality contrasts with the more relaxed and informal atmosphere of the court, making him seem ridiculous.

2. His lack of understanding: Shōnagon recounts how Masahiro struggles to grasp simple ideas or concepts. He is easily confused and often misunderstands jokes or situations, making him appear foolish. This lack of understanding could be seen as a mark of his intellectual inferiority, contributing to the perception of him as a laughingstock.

3. His exaggerated actions: Shōnagon describes Masahiro's actions as being overly dramatic and theatrical. He tends to overreact to situations and make a big show of himself, which comes across as contrived and silly. This tendency to exaggerate his emotions further reinforces the impression that he is a figure of amusement rather than respect.

While Shōnagon doesn't provide a list of three specific actions, her subtle portrayal of Masahiro's mannerisms, misunderstandings, and over-the-top behavior paints a clear picture of someone who is not taken seriously and often the subject of ridicule.