There are a few movies over the past few years that have duplicate themes. These are called "Twin Movies."

In 1997, Armageddon and Deep Impact were the same theme with a comet hurling towards earth and a group of astronauts launched to stop it.

In 2006, two magic movies: The Prestige and The Illusionist. Both movies about a magician and their odd and tangled practices.

In 2009, both mall security movies: Mall Cop, and Observe and Report.

In 2013, Olympus and White House Down, almost the same movie with an attack on the White House.

Yesterday we watched Dark Skies with Keri Russell and it was real close to Mel Gibson's Signs. How many movies can you add to the list that have the same theme?