Cliff Clavin Strikes Back
This is the way the internet works. I was reading kottke.org, which is brilliant, as usual. It links to an article showing what films have the most Star Wars actors in a non-Star Wars movie. And it's a geeky list, and unsuprisingly, the "winners" of that list were Labyrinth and Flash Gordon.

But what stuck out to me, as I quickly glanced at that page, was one name: John Ratzenberger. Yes, Cliff Clavin. (I actually had assumed his characters last name was Claven, but nope...it's Clavin.)
Cliff Clav--er, John Ratzenberger - was in The Empire Strikes Back, playing someone named Major Bren Derlin. This is just astonishing to me. I'm sure it was a bit role, but I really will have to keep my eye open the next time I watch that baby. If I find out that George Wendt was the voice of Jabba the Hut, I might shit myself.