The show with the shortest name may have the biggest stunts. O, which is the French word for water, takes place in and above a giant pool, with a team of acrobats, divers, and synchronized swimmers that includes a few former Olympians. Among the spectacular moments is a high dive in which performers -- as a group -- drop 60ft into a minimally exposed body of water below. You'll also see divers propelled in the air, acrobats on giant swings, and a fire act that leaves one brave dude fully engulfed in flames. Definitely a nail-biting show for anyone who gets nervous when people run around a swimming pool. The show is so impressive, the Wynn basically did their own version of it with Le Reve.