May 11 marks National Twilight Zone Day, a time to celebrate the much-loved mystery series.

The world was first introduced to "The Twilight Zone" in 1959, and it easily made its mark in pop culture. The sci-fi series often had mysterious concepts that pushed the boundaries of its viewers' imaginations.

Considered as one of the greatest television series of all time, "The Twilight Zone" was ranked as the fifth best TV series ever by TV Guide in 2013. Even after the end of the original show, its iterations continued to fascinate people. Just like the mysterious show, it remains a mystery as to why the annual event is celebrated on May 11.

How to celebrate National Twilight Zone Day

To celebrate the occasion, why not watch all your favorite episodes, whether it's from the original series or the more recent reincarnations. Those who are feeling extra adventurous can choose to watch some of its scariest episodes.

Fans who have "The Twilight Zone" board game can choose to spend some time playing it, while others can share their favorite episodes, moments or even memorabilia with others on social media. 

To celebrate the occasion, let's have a look at some memorable quotes from "The Twilight Zone" that may trigger your imagination. (Courtesy, Twilight Zone Wiki, PuckerMob and AZ Quotes)

  • "You're traveling through another dimension, a dimension not only of sight and sound but of mind. A journey into a wondrous land of imagination. Next stop, the Twilight zone!"
  • "Up there, up there in the vastness of space, in the void that is sky, up there is an enemy known as isolation."
  • "Maybe you haven't been looking in the right place. You've been looking behind you, Martin. Try looking ahead.
  • "But it makes you wonder, doesn't it? Just how normal we are? How normal the people we nod our hellos to as we pass on the street."
  • "Some people possess talent, others are possessed by it. When that happens, the talent becomes a curse."
  • "They say a dream takes only a second or so, and yet in that second a man can live a lifetime."
  • "Odd how the real consorts with the shadows, how the present fuses with the past."
  • "A sickness known as hate. Not a virus, not a microbe, not a germ. Highly contagious. Deadly in its effects. Don't look for it in the Twilight Zone. Look for it in the mirror. Look for it before the lights go out altogether."
  • "What you feared would come like an explosion is like a whisper. What you thought was the end is the beginning."
  • "We know that dreams can be real, but who ever thought that reality could be a dream?"

the twilight zone A view of the red carpet background shows the title "The Twilight Zone" during the show's premiere at the Harmony Gold Preview House on March 26, 2019 in Los Angeles. CBS All Access begins airing the episodes on April 1. Photo: Valerie Macon/AFP/Getty Images