Jason Alexander, McDonald’s

To fill the time between his roles in The Burning and “Seinfeld,” Jason Alexander swapped his dignity for money in this McDonald’s ad.

Megan Mullally and John Goodman, McDonald’s

Here’s a twofer — Megan Mullally and John Goodman both appear in this early-’80s commercial for Egg McMuffins. At the time this was filmed, Goodman’s only film credit was for a role in 1977’s Jailbait Babysitter.

Leonardo DiCaprio, Bubble Yum

The hair, the plaid shirt, the boombox, even the font — back in the day, this was an ad for bubblegum; now it’s like a 15-second mini-documentary on the hip styles of the early ’90s.

Keanu Reeves, Kellogg’s Corn Flakes

A thousand people are about to sit down to eat corn flakes? What kind of Jonestown-style shit is about to go down here anyway?