The song "We Are Number One" was named "Dank Meme of the Year" in 2016 on the Reddit subreddit /r/dankmemes, a popular subreddit for memes. The Robbie Rotten memes began in October that year when Stefán Karl Stefánsson, the actor who plays Robbie Rotten, announced that he was diagnosed with pancreatic cancer and was going to have surgery. A GoFundMe page was established by LazyTown head writer Mark Valenti to help the actor as he endured his illness. "We Are Number One" and many other LazyTown videos were used by meme fans as a way to promote the fundraising effort, which eventually surpassed its $100,000 goal. The campaign was popularized by the YouTube channel SiIvaGunner uploading a "We Are Number One" video. To thank his supporters, Stefánsson celebrated by uploading a video of that song performed with his former cast members and LazyTown's composer. On 13 August 2017, Stefánsson was declared cancer free after a successful surgery. However, in March 2018, Stefánsson announced his cancer had returned and it was terminal.