How about his master's thesis.  In "A Symbolic Analysis of Relay and Switching Circuits" Shannon proved that you could use boolean algebra to simplify the arrangement of electromechanical relays in telephone routing networks and then in the same thesis inverted the reasoning to show that by using these relays in the proper arrangement you could solve boolean algebra problems.  All digital computers have some DNA that leads back to this paper he wrote when he was 21...<p>As comic-book guy would say: Best. Master's Thesis. Ever.