In late 1944 a team of American scientist, known as the "Alsos" team, was sent to western Europe to search for evidence of a German atomic bomb project. When Allied troops reached the Rhine River, the team filled several bottles with river water and sent them to Washington to be analyzed for radioactivity with the thought that there might be a German nuclear facility somewhere up stream. As a joke, they included a bottle of French wine with a note attached saying that it tasted funny and should be analyses too. Ironically, the water tested negative, but the wine had a small trace of radioactivity.
Source: Heisenberg's War
World War Trivia and Cartoons - Riebel-Roque Publishing Company