This is the shirt of xkcd’s Comic #149, which is so far the most widely-distributed comic xkcd’s ever done. It was spotted on the walls at Amazon headquarters and on some of the bigger blags. And now, as per your many email requests, here it is on a shirt!
“Make me a sandwich.” “What? Make it yourself.” “Sudo. Make me a sandwich.” “Okay.” conversation on in white on a black, 100% cotton t-shirt.