def identical_item(list1, list2):
    """Returns the first common element.

    Return values:
        If a common element in list1 (<list>) and list2 (<list>) was
        found, that element will be returned. Otherwise, <None> will be
        returned.
    """
    for item in list1:
        for part in list2:
            if item == part:
                return item
    return None