IMPOSSIBLE TRIVIA: McDonalds First Added This in 1968?

You had the chance to win tickets to see Sheryl Crow live at Caesars Atlantic City, Thursday August 9th this morning playing Lite Rock Impossible Trivia, but no one got the right answer. I will carry those tickets over to Monday and add a pair of tickets to see the American Idol Top Ten Tour live at Boardwalk Hall... on Friday September 7th if you come up with the answer.

The question: McDonald's Restaurants added this for the first time in 1968.  What is it?

Give me your best guess Monday @ 7:20a.m. to win tickets for Sheryl Crow and the American Idol Tour on the Lite Rock Morning Show.