Look, sometimes the most important thing you can offer, with your clothes, is clear messaging about what you feel and what you think about people messaging you. I made this shirt inspired by Dr Laevantine’s seminal pinned tweet of philosophy:
Welcome to my book of philosophy, “Maybe Don’t;” it has one doctrine, where you fucking don’t (Laevantine, Twitter, 2017)
Here’s the design: 
And here the design is on our friendly gormless supposedly unisex Redbubble model:
And here’s the design being modelled by the Teepublic ghost:
This design is available on a host of shirts and styles, stickers and mugs and if you work in some kind of college facility where you get your own mug in some sort of office kitchen, contact me and I’ll see about getting you a discount for your workplace.
You can get this design on Redbubble (in white text or black text) or on Teepublic (again, in white text or black text).