Monday Matinee: "The Elevator"
If you wanted me to sit still in the 1980s (thankfully they weren't handing out ADD meds like candy back then for kids that had a little restless streak in them), you had to put me down in front of The Twilight Zone. This particular episode had me spellbound. It had everything that a young boy could imagine: exploration of an abandoned research lab, an intriguing plot about fixing the world's hunger problem, and giant spiders.
Really, really big spiders.
It's short, but still really effective...