In the true spirit of hilarious T-shirts for geeks involved with internationalization and/or computer typography, CafePress/NuclearTacos provides the

I {entity} Unicode T-shirts!

Now available in both Windows and Mac versions:

         

Celebrating what happens when the font that you need is either not there or not linked properly. :-)

When I wore the Windows one in the hallways of Microsoft, an impressive number of people got the joke (though like me, they may have realized they really are truly internationalization geeks because they got it!).

Highly recommended, and for the record: no I do not get any kickback for the recommendation. :-)