Why do we always put "I" or "me" at the end of a list of nouns in a sentence. For example we would say "John, Sam, and I are going to the mall" instead of "I, John, and Sam are going to the mall"
Is there a grammatical/logical reason for this, or is this just a convention that we're accustomed to? The sentence would make just as much sense no matter where "I" goes in the list.