Mac Tonight was the name of McDonald's moon-headed character in its 1986 advertising campaign.
The character appeared as a person with a crescent-moon head, dark sunglasses, and a tuxedo. Mac Tonight was designed to promote McDonald's evening business, especially the idea of visiting the restaurants at night.
His commercials used a rewritten version of the song “Mack the Knife,” changing the name to “Mac Tonight.” The campaign became especially recognizable because of its unusual character design and its focus on nighttime dining rather than only on hamburgers or children.
Mac Tonight is sometimes confused with McDonaldland characters such as the Hamburglar or Grimace. Unlike those characters, Mac Tonight was created for a separate late-1980s advertising campaign centered on evening service.