My friends and I like to play ‘Opposite Day’ which as wikipedia describes is:

a holiday which is celebrated by many schoolchildren, though often in an irregular fashion and not on any pre-determined day of the year. Typically, when Opposite Day is declared, statements always mean the opposite of what they say. In the sense that it would “excuse” untrue statements, it is related to the notion that crossed fingers automatically nullify promises.

Of course as I explained to my dad, if you say ‘it’s opposite day’ you are making a false statement and if you say ‘it isn’t Opposite Day’ you are always making a true statement.  My dad explained this is known as the ‘liar paradox‘.  After explaining what paradox meant, I suggested we call it the Opposite Day Paradox instead.  Dad agreed.  Dad then went on talk about time travel and the associated paradoxes it would create, but I told him that time travel was impossible and we started tickling each other.

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