And that’s why we say “porque sí” and not just “porque”. It’d be so confusing! :P

It’s confusing enough, we actually have 4 different forms:

• Porque (because)

• Por qué? (why?)

• (el) porqué: the reason why

• Por (el/la/lo) que: I don’t think this is used anymore without the article, but some linguist correct me please.

Most people don’t know how to use the latter two, even I am still confused about the last one.