A rather... prickly question!
To be honest, it's not biologically possible for a human (or any living being) to literally become a pineapple. Pineapples are a type of tropical plant that grows on soil and requires specific conditions to thrive, whereas humans are complex organisms with our own unique biology and physiology.
However, if you're asking in a more figurative or humorous sense, I suppose one could interpret "being a pineapple" as embracing the qualities that pineapples are known for, such as:
1. Being sweet and juicy (having a positive attitude and being kind to others)
2. Having a tough exterior