The Grass is Always Greener Over the Septic Tank on YouTube was linked in the Erma Bombeck thread and in that video at about 4:07 is a kid with a speaking part in a McDonald's commercial that I think I recognize as someone who became a popular actor. Who can name that kid?
Looks a bit like Tom Hiddleston but he's too young and not American. But it's also pretty low grade video so it may look like a lot of people. You may want to stay for the car commercial that follows, with Hal Linden. $6,089 for a brand new Chrysler Newport.