Wonderful honesty

"Sir, did you notice what the T-shirt of that resident reads?" one AP asked after the ward round. "No" I said "where?" "The front of her T-shirt." "No. Where is she?" "She is gone now. But it read: I don't get headaches, I give them." "That is very funny" said another AP. "And very honest" said another AP. I wonder if the resident knew she was being honest, or if she thought it was just a jpke.