Via The Comic's Comic, Vanity Fair has a retrospective on the making of the Star Wars Holiday Special, widely known as a television event that will live in infamy. Actually I'm pretty sure I saw it when I was a kid, and I don't think I found it agonizing. Still, I'm not surprised that Hamill, Fisher, and Ford were less than thrilled to be there. Nothing short of a kidnapped granddaughter could have made Sir Alec show up, I'm sure.
Here's a clip.
I like to think that what Artoo is really saying is, "Holy shit! These hairy crackers just started shooting meth. We need to get out of here before things get ugly."