on en a un

I was thinking earlier to day on how to say "we have one of them," and figured a correct way to say it would be on en a un. It reminded me of the Baltimore guys saying "Aaron earned an iron urn." Just kind of a silly thought, being near Baltimore.

Wonder if there are any other phrases like that - not the nonsense stuff like 'dans ta tente ta tante t'attend', but normal, everyday stuff that people may stumble over when speaking.