Mac Tonight was the moon-headed McDonald's character used in late-1980s evening advertising.
Mac Tonight appeared in a campaign designed to promote McDonald's as an evening destination. The character wore sunglasses and sang a modified version of “Mack the Knife,” creating a distinctive musical and visual identity separate from the earlier McDonaldland cast.
The campaign began in 1986 and became especially associated with McDonald's nighttime branding. Its moon-shaped head made the character immediately recognizable and connected the product message to the time of day rather than to a particular menu item.
Mac Tonight is sometimes confused with Birdie the Early Bird, whose role centered on breakfast, or with Ronald McDonald, the chain's principal mascot. Mac Tonight was a campaign character with a specific evening focus. The use of the song also led to a legal dispute involving Bobby Darin's estate, which affected the campaign's later use.