One of my logic students showed up to their final with a fresh "x=x" tattoo. It was immensely flattering and also seemed unlikely to be useful to them on the exam.
I have a joke tattoo which says \forall\exists. Once at a conference I got approached and asked, in a very serious way, if it was meant to be \Pi⁰ or \Pi¹.
Comments
Tautologies FTW.