For spaghetti-western comedy the Trinity series is good. They call me Trinity, Trinity is still my name etc - (Terence Hill and Bud Spencer).
Sci fi - Outland and Enemy Mine.
IF you suffer from insomnia, then watch The National Parks: America's Best Idea by Kent Burns. Now, don't get me wrong, the visuals are very nice and the information presented is good, but the monotone naration put me to sleep several times in as few as 10 minutes watching it. Good thing I had it on TiVo when I watched it.
For Spaghetti Westerns, “Duck You Sucker” Is a good one.