"Kristen and I were doing interviews in a hotel in Brazil and all of a sudden our security barges in and locks the door... and they said, 'Remain calm, about 2,000 girls just broke through the hotel lobby and they're on their way up the stairs to get to this room.' Then they went, 'It's OK because we have the National Guard on their way.' And the National Guard actually did show up." Taylor Lautner on his scariest moment while promoting the Twilight films in South America with co-star Kristen Stewart.