[AmityvilleHams]

Not too sure.It could be boredom,a fun activity that has been found,or just taking advantage of the fact that plastic is lightweight and fun to throw around!A good way to fix this is just get a ceramic bowl.It doesn't have to be specifically made for hamsters though,just something that is an actual food bowl.Ceramic is easy to clean,chewproof,and too heavy to be moved around unlike plastic.