30 nearly identical pairs of movies that came out around the same time

Remember when "Finding Nemo" and "Shark Tale" were released around the same time? Or when "Batman v Superman: Dawn of Justice" and "Captain America: Civil War" came out just months apart? 

It's not the first time two movies with similar themes have come out around the same time. In April, a movie called "Pet Graveyard" will be out on DVD and digital days before Stephen King's "Pet Sematary" remake comes to theaters.

This phenomenon of "twin" movies is actually somewhat common. Forbes contributor Mark Hughes explained in a 2011 Quora post that while sometimes the release of two similar films is just coincidence, it could be to piggyback off a competitor's potentially successful — or already successful — project. 

Read the rest of his explanation here, and keep scrolling to see more "twin" films that have come out months apart in theaters over the years.

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1993/1994: "Tombstone" and "Wyatt Earp" are both centered around Western lawman Wyatt Earp.

Box Office
"Wyatt Earp": $25 million
"Tombstone": $56.5 million

Neither film did overwhelmingly great at the box office. "Tombstone," starring Kurt Russell and Val Kilmer, edged out the Kevin Costner and Dennis Quaid film from Warner Bros.

1997: "Dante's Peak" and "Volcano" both revolve around the cast outrunning erupting volcanoes.

Box Office
Dante's Peak": $178 million 
"Volcano": $122.8 million

Fox got a little excited with its over-the-top posters for "Volcano." The film did nowhere near as well as Pierce Brosnan's volcano epic in the states; however, the Los Angeles centered movie picked up overseas.

1998: The Earth was nearly destroyed in both "Armageddon" and "Deep Impact."

Box Office
Armageddon": $553.7 million
"Deep Impact": $349.5 million

Bruce Willis saves the world from an asteroid in the first film, while Robert Duvall tries to stop a massive comet from colliding with the planet.