The shirt reads: “MY DOG ATE MY PRONOUNS — HE-SHE-IT EVERYWHERE.”
Four lines of plain white capitals, no illustration. The joke is hidden in the third line and only appears when you say it out loud.
It is a spelling trick of the oldest kind, the sort that used to go round on a folded note in a classroom. Read it once and it is a grammar lesson; read it again and it is not. For anyone whose favourite humour is the kind you have to be caught understanding.
