It’s 11/11/11! In honor of this rare numerical occurance on the calendar, have a look at these 11 interesting facts about the number 11!

1. “These go up to 11.”

In the movie This Is Spinal Tap, the character Nigel Tuffnel (played by Christopher Guest) talks about his guitar amps that have an 11th volume setting. What has become possibly the most quoted bit from the film, in 2002, the phrase was added to the Shorter Oxford English Dictionary with the definition “up to maximum volume.” Fans of Spinal Tap are celebrating today as Spinal Tap Day or Nigel Tuffnel Day, so this would be a great movie to watch today.