At first I actually typed the title as "Have you ever thrown a boomerang in zero gravity". And you know why I changed the word to weightlessness instead. :P
Anyway, this is Japanese astronaut Takao Doi, on board of the International Space Station, who has proved that a boomerang returns to the person throwing it even in the zero-gravity conditions. The idea came to him by request from his friend Yashuhiro Togai, a world boomerang champion. The result is exactly what the science behind boomerangs predicts.
Interesting huh. :)