Acabei de descobrir

A definição acabada da maior parte dos textos do João Miranda (este, por exemplo). Na Wikipedia, naturalmente. Vejam lá se não vos lembra alguns posts:

The fallacy of the undistributed middle is a logical fallacy that is committed when the middle term in a categorical syllogism isn't distributed.

For example:

All students carry backpacks.

My grandfather carries a backpack.

Therefore, my grandfather is a student.