'He's always being stupid'

This years Nobel prize for Physiology or Medicine has been given to Barry Marshall and Robin Warren, for figuring out that the bacteria Helicobacter pylori was responsible for many stomach ulcers (link). Warren found the bacteria in the stomach of many people who had ulcers. In order to test whether the bacteria caused the disease, Marshall swallowed the bacteria, and duly suffered gastritis. The Times reports that his wife says,

That’s a very Barry thing to have done... He’s always being stupid, bad jokes, puns, that sort of thing.