def isprobablytitle(s):
    """Return True if string s looks like it could be a title; False otherwise.

    This is a heuristic function based on my Gutenberg Poetry corpus. Takes
    every word from string s with five or more characters
    and returns True if the resulting joined string is in title case.

    >>> isprobablytitle("The Day The Earth Stood Still")
    True

    >>> isprobablytitle("The Day the Earth Stood Still")
    True

    >>> isprobablytitle("the day the earth stood still")
    False

    """
    s = ' '.join([t.capitalize() if len(t) <= 4 else t for t in s.split()])
    return s.istitle()