You better heed the words on the 100% cotton S.H.I.E.L.D. Keep Calm Coulson 30 Single T-Shirt. If you don't keep calm and get this shirt in order to continue to be calm, Agent Coulson will taze you and watch Super Nanny over your passed out body. He is authorized to do that sort of thing by Samuel Jackson...who is apparently allowed to dole that kind of power out. The S.H.I.E.L.D. Keep Calm Coulson 30 Single T-Shirt mixes Agent Coulson with the old British Propaganda poster so engage in the repeating cycle of keeping calm!