Gravity and boomerangs
It is believed gravity is needed for a boomerang to fly back to the throwing spot, but no one has tried in zero gravity.
A boomerang operates primarily aerodynamically. It's actually shaped like a bent wing. I don't know if there's enough room in the ISS for this to work, but if you did have a very large place (an orbital sports stadium or something) with air and no gravity, you might have to modify the throw a bit, but you could certainly make it come back. In fact, a skilled thrower might be able to get it to go in circles for a while.