[chmod775]

Generally you're using language "correctly" when the vast majority of people understand what you were trying to communicate.

In that way and in that context it's a "passable" statement.

Don't view everyday life and sentences through the narrow lens of mathematics/logic. If you're lucky that'll make for some dinner conversation, if you're unlucky you'll just be annoying.

"I know this must be leaking because it smells." is fine in an everyday context, even if not strictly and always true.

[droussel]

It wasn't meant in the sense of "I know it leaks because of the smell", it was literally said as "The leakage is caused by the smell". The conversation was in French so I have to translate here :D. I wasn't trying to be an ass at the time, I was just... surprised at their twisted understanding of basic logic.