The Star Wars Holiday Special -- because @TheGameChanger made a cringe thread where he linked that and I didn't think it could possibly be as bad as its reputation.
It was worse.
The movie is incredibly long and incredibly boring, with many musical segments, and entire large spans of time with just wookie noises (and I'm not even kidding), which might be funny for a minute or two, but nah it just drags out way too long.
There's also absolutely nothing even remotely interesting about the movie at all -- none. I'm really not sure who the intended audience was, because that'd be boring as hell to kids, and it's boring as hell to adults as well.
If you attempt to watch it, I strongly recommend pacing yourself. Watch as much as you can stand, go do other stuff, watch some more, do other stuff, etc...
Is it worth it? No. But you're going to do it anyway.