Comic book legend Stan Lee also has another specialty -- cameo acting, as we've seen in his notable but minor appearancs in the various Marvel movies -- they include a hot dog vendor, a librarian, a security guard and even a Larry King-lookalike. To help promote its sponsorship of the upcoming Avengers Age of Ultron, Audi makes the most of Mr. Lee's sideline skills in this funny new film out of Muhtayzik Hoffer, which won the brand's social account earlier this year, and directed by Kevin Smith of "Clerks" and "Comic Book Men" fame.

In it, he teaches a class of "randoms" -- Smith himself, Tara Reid, Lou Ferrigno, Jason Mewes and Michael Rooker -- the nuances of a great cameo and how such jobs differ from "regular acting." If anyone, he's the one to do it because, as Mr. Smith says, "When it comes to small roles, Stan Lee is the biggest."

Mr. Lee has even started to make cameo appearances in Audi's Twitter feed.

Muhtayzik Hoffer has been turning out plenty of out-of-the-box ideas for other clients too, including Netflix and Google and was Ad Age's 2014 Small Agency of the Year . For more info on the 2015 Small Agency competition, deadline for which is April 29, head over to Adage.com.