Sometimes you just need a good excuse to TP your neighbor’s house…or leave a batch of chocolate chip cookies on that same neighbor’s doorstep. For either evil deed, or for good deeds, there’s Just Because Day.

Just Because Day is tomorrow, August 27, and it’s the perfect day to do whatever you please—literally anything. Such is the nature of “Just Because Day.” According to Holiday Insights, an internet depository for these unusual annual events and made-up holidays, it was dreamt up by a California man named Joseph J. Goodwin. Back in the ‘60s, Goodwin created the holiday in order to honor life, his family, and leisure time. He celebrated the first Just Because Day by giving his wife a transistor radio (“just because!” he told her). It became an annual tradition for the Goodwins and one that, presumably, spread from them via word-of-mouth.

So if you’ve ever wanted to act on a totally illogical impulse to sing Bon Jovi’s “Livin’ on a Prayer” in Dutch during an important business meeting now you’ve got an excuse…provided you do so tomorrow. That’s not to say that you can’t engage in a more philanthropic activity like volunteering at a soup kitchen or helping an elderly woman cross the street. Or you could do…absolutely nothing. Just because.

What will you be doing on Just Because Day?