Well, due to Skywalker's reckless attitude, Obi-Wan suggested to Luke that he should install a roll bar in the land speeder. Apparently, Luke responded, "You're not the boss of me, old man!!" Skywalker then jumped into the land speeder, raced away and started to 'pop wheelies' around the cantina. The Sand peoples' mouths were wide open in shock as they witnessed Skywalker racing the land speeder around and giggling like a school girl. Alas, it was a dark, dark day for The Force......