It's true about celebrating on one day a year. It's more of a surprise if you get something just because any time of the year.
I buy The Maddestman things if I see something that I know he likes or needs all year if I have the cash, he does the same thing.
When I grabbed the tshirts, the first thing that came to mind was Valentines day (probably because of all the advertising around me) so I gave it to him and said Happy Valentines.
However it is a good excuse to find a babysitter and spend some time together alone.

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