South Korean rapper Psy released his music video "Gangnam Style" last year, and since has gone viral. (Credit: YG Entertainment/ABC)

Happy birthday to one of the world's most watched viral videos, Psy's "Gangnam Style," and the dance move it inspired.

As of 4:20 p.m. ET, a year to the day the video was posted, the YouTube sensation has been viewed 1,742,458,065 times - and probably more since you first clicked on this story. That makes it the most watched YouTube video ever, surpassing Justin Beiber's "Baby" video in December.

A month after the video took off, the then-about-to-be-household-name told us what the song was about: "Gangnam means, it's like Beverly Hills of Korea," said Psy, or Jae-Sang Park. "But the guy doesn't look like Beverly Hills, dance doesn't look like Beverly Hills … and the situation in music video doesn't look like Beverly Hills. But he keeps saying I'm Beverly Hills style. So that's the point. It's sort of a twist."

To celebrate, here our favorite videos inspired by the viral hit…

The "Halloween House" in Leesburg, Va., that synced 8,500 bulbs to the hit:

The Thai inmates dancing in a prison competition:

Who could forget the lifeguards who were fired after they posted their video?

… and that time the dance crazy takes over Times Square and "Good Morning America":

Because no "Gangnam Style" list is complete without George Stephanopoulos reading the paper behind the dancers.