I just got home from playing pool with an old friend from work. We were talking about being ambidextrous at pool, and he said that a true test is to try drawing a circle with one hand while simultaneously drawing a square with the other hand. I tried to do that but the shapes came out suspect. When I asked him where he got this test from, he replied that Xiao Long Nu from the chinese tv serial is ambidextrous this way. lol.