What's the Worst Special Effect You've Ever Seen?

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I saw this compilation of terrible special effects—both computer-generated and practical—and couldn’t help but wonder what they missed. Mind giving me a hand?

The creature from The Giant Claw is a well-known cinematic atrocity. I also have a soft spot for the way the 1950s horror flick Beginning of the End made “giant” grasshoppers by putting regular-sized grasshoppers on photos of buildings. Heck, we could spend days just discussing scenes from Doctor Who. So please add the worst special effects that you remember in the comments!

Contact the author at rob@io9.com.