The research is being done to compare two variants of the laryngeal mask airway: the Proseal laryngeal mask airway and the Laryngeal mask airway Supreme. This study will determine if the newer model, the Laryngeal mask airway Supreme, is easier to insert and is better positioned than the older model, the Proseal laryngeal mask airway. Both models are approved for use by the FDA, and are routinely used to assure the airway during general anesthesia.