Here's why:
* Their interactions: They share a close friendship, often seen together at events or helping each other out.
* Big Macintosh's personality: He's kind, patient, and supportive, which aligns with Pinkie Pie's need for affection and attention.
* Pinkie's actions: There are instances where Pinkie shows a bit of a playful flirtatious side towards Big Macintosh, like in the episode "The Last Roundup" where she's excited to dance with him.
However, it's important to remember that:
* The show focuses on friendship: The show primarily emphasizes friendship and the power of teamwork, leaving romance as a background element.
* Pinkie Pie's bubbly personality: Her energy and enthusiasm could be interpreted as friendly rather than romantic, especially towards someone she's close to.
Ultimately, whether or not Pinkie Pie has a crush on Big Macintosh is up to interpretation. The show itself doesn't explicitly confirm it, but it's a fun theory that many fans enjoy!