Village of the Giants

This 1965 Bert I. Gordon picture has young "Genius" (Ron Howard) tinkering with substances in his lab, creating a "goo' that causes whatever ingests it to grow to tremendous size. Unfortunately, some ne'er-do-wells blow in from out of town, and steal the goo and eat it, becoming the eponymous Giants. Now it's up to several teens as well as Genius to set right what went wrong.

For the Mystery Science Theater 3000 episode see here.

Village of the Giants contains examples of the following tropes:

 * Attack of the 50-Foot Whatever
 * Be Careful What You Wish For: Directly invoked in the movie as some of the giants aren't happy with their new size.
 * Child Prodigy: Conveniently named "Genius".
 * Curtain Clothing: After the giants outgrow their clothes, they make new ones out of the theater's curtains.
 * Fan Service: The first five minutes or so fo the movie qualifies.
 * Giant Spider: Mike and his girlfriend lock up the Goo, then practically turn around to find a huge growling tarantula behind them. They dispatch it by flooding the floor and breaking a light bulb and tossing it into the water, zapping the spider.
 * Magic Pants: Averted for Fan Service.
 * However, the curtains the giants end up wearing do eventually shrink.
 * Male Gaze: There are a lot of shots of jiggling butts and breasts, giant or otherwise.
 * And a duck's fanny, in case your tastes run in that direction.
 * Marshmallow Hell: Horsey is held to the chest of one of the more bosomy giants. He seems more worried about being dropped, though.
 * Non-Indicative Name: The eponymous giants come from out of town.
 * Plot Induced Stupidity: Very nearly allows the attempt to capture one of the giants with a motorcycle to succeed.
 * Popping Buttons: Merrie's sweater after she eats the Goo and starts growing.
 * The Schlub Pub Seduction Deduction: Performed in an attempt to get the formula for the "Goo." It fails epically.
 * For some reason, it works a lot better when one of the other delinquent girls talks to Genius.
 * Totally Radical: "Dig that nitty-gritty!"
 * What Happened to the Mouse?: Whatever happened to the giant cat?