Please answer the following question: I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Snakes on a Plane Movie plot: After witnessing gangster Eddie Kim (Byron Lawson) brutally beat U.S. Prosecutor Daniel Hayes (Scott Nicholson) to death in Hawaii, Sean Jones (Nathan Phillips) is escorted by FBI agents Neville Flynn (Samuel L. Jackson) and John Sanders (Mark Houghton) on a Boeing 747-400 to testify at the trial in Los Angeles.Despite increased security for the flight, Kim arranges for a time-release crate full of venomous and constrictor snakes to be placed in the cargo hold, in an attempt to bring down the plane before it reaches Los Angeles. To ensure the snakes attack the passengers, he has one of his henchmen, disguised as an airport ground employee, spray the passengers' leis with a special pheromone, which will cause the snakes to aggressively attack without being provoked.The crate pops open midway through the flight and the snakes start making their way into various areas of the plane. A cat in the cargo bay, a young couple having sex in the lavatory, and a man using the bathroom, are the first killed. One of the snakes causes a short in the plane's electronics, so the plane's captain, Sam McKeon (Tom Butler) investigates by climbing down into the hold underneath the cockpit and resets the breakers. Before he can climb back up the ladder, he is struck and killed by a viper.Co-pilot Rick (David Koechner) is alerted that the captain is down by Flight Attendant Claire Miller (Julianna Margulies). Rick believes the captain has suffered a heart attack. The stewardess goes to get Flynn and Sanders, who help move the captain's body.Later, some coral snakes enter the cockpit and Rick uses his clipboard to hit them, accidentally releasing the oxygen masks throughout the plane. The snakes are then able to enter the cabin through the holes where the oxygen masks had been and they begin wreaking havoc among the passengers.Numerous passengers, including Agent Sanders, are killed. Agent Flynn enters the cabin and uses a stun gun to ward off the snakes as he makes his way back. He realizes he has to turn around, as there are too... My question: What dropped into the cabin with the oxygen masks?
A:
snakes