This vid is a classic, in a strange and too-awful-not-to-watch way.
Donny and Marie Osmond have a go at making Star Wars a musical, starring as Luke and Leia. Somehow they manage to drag Kris Kristofferson into the act, hamming it up as Han Solo. Meanwhile, a platoon of Storm Troopers dance and sing Motown and showtune classics while R2-D2 panics. It may have been the 70s, but still, there can be no excuse for this level of showtime disaster.
Remember, Luke and Leia did turn out to be brother and sister – maybe the Osmonds were on to something way before the rest of us.