Get Out of Jail Free Card

I figured I was going to have to do a lot of explaining about my silence, so I made up this card and had it laminated: "Please excuse my silence. I am not trying to be rude. I am on voice rest." I thought I would hand it to cashiers and receptionists as a quick and easy way to explain my situation. It did not, however, have the intended effect. One person barely scanned it while she continued to talk non stop to me. Another read it and promptly asked me a question! I threw the card away.