But some people expected that: "The observers set up a betting pool on the results of the test. Edward Teller was the most optimistic, predicting 45 kilotons of

But some people expected that: "The observers set up a betting pool on the results of the test. Edward Teller was the most optimistic, predicting 45 kilotons of TNT (190 TJ). [...] Others were less optimistic. Ramsey chose zero (a complete dud), Robert Oppenheimer chose 0.3 kilotons of TNT (1.3 TJ) [...]" (Wikipedia)