Can you walk on your hands?
CAUTION: although some of the commentaries mentioned may seem "out there", remember it's all written with Ruach HaKodesh (Hayom Yom - 6 Shevat).
Listen to the end for alternate explanation.
Did Moshe have slow reflexes? When you can ignore G-d, and signs of true leadership.
Can you learn Torah while standing on one leg? Understanding how loving your fellow Jew, helps avoid reincarnation. לע"נ שרה מרים בת אברהם