For a while, back in the 1980s and 90s, McDonald's sold pizza at some of its restaurants. Then it stopped doing so.
Now with this kind of brief you might expect some kind of a linear detective narrative, but if you do you'll certainly be disappointed! Because Brian takes this mundane-sounding question seriously, perhaps a little bit too seriously, and he also tends to get easily sidetracked along the way.
We speak to Brian and play an excerpt from Episode 72 of the show. And as well as being a self-taught investigative journalist, Brian is a writer, performer, actor and comedian based in Los Angeles.
What's On Your Headphones? Brian Thompson of 'Whatever Happened to Pizza at McDonald's?' shares some listening recommendations
The Best Show with Tom Scharpling
Whitley Strieber's Dreamland "...hosted by a guy who claims to be an alien abductee and talks to people who believe in everything from cat ghosts to psychic yogurt."