The shirt reads: “LIBS DON’T KNOW JACK — WHICH IS A SHAME BECAUSE HE’S A REALLY GREAT GUY.”
Between the lines, several hooded reaper figures loom out of red smoke and lightning, drawn in heavy airbrushed detail.
The joke is a reading of the idiom as a literal person named Jack, and the second line does all the work. The artwork is considerably more menacing than the punchline warrants.
It reads as politically partisan whether or not the pun is the point, and anyone considering it should know it will be taken that way.
