#grammar could save your life, friends. Happy spooky season to all my fellow grammar pedants.

Always reminds me of one of my English teachers at school who, whenever a pupil said 'my pen has run out', would open the classroom door to give it a clear exit.

So in French Belgian, they also use "savoir" instead of "pouvoir" (to have the knowledge vs. the have the capacity of). So you may hear "je ne sais pas savoir" (I cannot know) which no French speaker, other than Belgian, would ever say. It's a translation of Dutch apparently.