Clever tees have been an attraction for quite a while now. Less generic, and more fun mashups. This one is an example from a few years ago.

viva_la_evolucion

Once, when I wore this while out in a group, one kind soul complimented the design. Another person in the group immediately commented that people wore such tees to send a “look how smart I am” message. My views was that at least for me, it was less vanity/personality and more a means of expression and identity, which served as a conversation starter, given my less-than-gregarious nature. But it did stay with with me, and make me wonder whether he had a point. More