When you depart from standard usage, it should be deliberate and not an accidental lapse. Like a poet who breaks the rules of poetry for creative effect, this only works when you know and respect the rule you are breaking. If you have never heard of the rules you are breaking, you have no right to do so, and you are likely to come off like a buffoon or a barbarian. Breaking rules, using slang and archaic language can be effective, but it is just as likely to give you an audience busy with wincing.
