Pi aren’t square, they’re awesome! Better than awesome—pimp, even! You can get this yourself an instance of this t-shirt and many other hilarious shirts from T-Shirt Hell. (WARNING: If you’re easily offended, you seriously don’t even want to look—they’re as irreverent as it gets.)
There are not many of their shirts that I, personally, would be caught wearing in public. But if you’re braver than I am, I’ll (seriously) buy you a coffee if I see you in public in any of their shirts other than this one.