Introduction:
In the story "Mrs. Packletide's Tiger" by Saki (H.H. Munro), Miss Mebbin is a character known for her peculiar laugh. Her laughter is described as "disagreeably pleasant" because it creates a contradictory and somewhat unsettling effect on those who hear it. This description highlights the unique nature of her laughter and adds depth to her character.

Explanation:
1. Contradictory Nature: Miss Mebbin's laugh is referred to as "disagreeably pleasant" because it combines two contrasting qualities. On one hand, it is pleasant, indicating that it has a pleasing or enjoyable quality. On the other hand, it is disagreeable, suggesting that it may be annoying or unsettling. This contradiction in terms creates intrigue and captures the attention of the reader.

2. Unusual Sound: Miss Mebbin's laugh is described as having a peculiar sound. It is likely that her laugh is distinct and stands out from the usual laughter people are accustomed to. The combination of the pleasant and disagreeable aspects of her laughter might create a unique tone or pitch that is unfamiliar and catches people off guard.

3. Effect on Others: The description of Miss Mebbin's laugh as "disagreeably pleasant" implies that it has an impact on those who hear it. The use of contradictory terms suggests that her laughter has the ability to both attract and repel others. It may be disconcerting for people to have such conflicting emotions when they hear her laugh, which adds to the overall intrigue and complexity of her character.

4. Characterization: The description of Miss Mebbin's laugh helps to create a distinct personality for her. It suggests that she is someone who does not conform to societal norms or expectations. Her laugh sets her apart from others and adds an element of unpredictability to her character. The contradictory nature of her laughter might reflect her overall personality and demeanor.

5. Symbolic Meaning: The label "disagreeably pleasant" could also be seen as a metaphor for how Miss Mebbin herself is perceived by the other characters in the story. She is someone who is seemingly pleasant on the surface, but her actions and intentions may not always align with her outward appearance. This contradiction adds depth to her character and keeps the readers engaged.

Conclusion:
The description of Miss Mebbin's laugh as "disagreeably pleasant" in "Mrs. Packletide's Tiger" adds complexity to her character and creates a unique and memorable impression. Her laughter stands out due to its contradictory nature, and it symbolizes the contrasting aspects of her personality. The use of this description enhances the overall reading experience and contributes to the depth of the story.