If you have to be opposite on opposite day can there ever be an opposite day if you are opposite on opposite day?
If you have to be opposite on opposite day, that makes it a day,
and then there was no opposite day. But that can't be true since
you HAVE to be opposite, which means that you have to be normal
even though there is an opposite day because you are supposed to be
opposite on opposite day, which means that you act normal as if it
was a normal day, because that is the opposite of opposite day.
(This is a classic "liar's paradox". Since there is already an
opposite day, you should have a normal day because that is the
opposite of an opposite day. But then it is not an opposite
day.)