Night of the Unicorns
The so-called "Night of the Unicorns," (coined by ubermann) occurred on the morning of Monday, April 23, 2007. This was the same night and some time after the creator of YTMND, max, introduced the "YFLY" top-right corner ads for a week. For a short time, max even applied a large bottom-right corner ad: File:Http://content.ytmnd.com/assets/images/left corner.gif
This strange night was so named for the short-lived unicorns from 'My Little Pony' in the background of the actual YTMND website, along with the song "Hey Hey You You" by Avril Lavigne in the background, essentially briefly making YTMND.COM an actual YTMND. See http://heyheyyouyou.ytmnd.com to see and hear an example of this phenomenon.