What pear is not a pear?

Answer 1

Nothing can be a pear and something that's not a pear at the same time.

Perhaps he/she means the prickly pear cactus whose fruit is called a cactus fig.

More information

When the pear is an acronym for the Princeton Engineering Anomalies Laboratory that used to exist at Princeton University but to examine psi phenomena, but closed around 2007. Their work lives on in the International Consciousness Research Laboratories, Psyleron, and the Society for scientific exploration.

Answer

I'm pretty sure this was a riddle. "What pear is not a pear" it is "When is a pear not a pair" and the answer is when there is only one you can't really write it out or it is to easy so this riddle is usually spoken.