When the clay-animation video for TOOL's “Sober” debuted in 1993, it transfixed nearly every hard-rock and heavy-metal fan who saw it. It was creepy, surreal, and unlike anything else on MTV. Subsequent videos boast different flavors (some are more informed by dystopian sci-fi, while for others it’s supernatural horror), yet each one builds on the alt-metal icons’ interest in animated visuals that are both nightmarish and deeply captivating.