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The backyard water slide with a bump in the middle and an inflatable crocodile's open mouth at the end: run, slide, hit the bump, and dive into the splash pool. It was advertised on kids' TV from the late 1980s, sold alongside a Super Crocodile Mile, and is routinely mistaken for a Wham-O product. It was made by a toy company called Marchon, later part of Empire of Carolina.
A strip of yellow plastic laid out on the grass with a garden hose attached — the simplest recipe for a perfect summer afternoon. You ran, you flew, you belly-flopped into grass and chlorine-smelling joy, and by August it had worn through entirely.
Engineer Lonnie Johnson's pump-action water blaster that transformed backyard warfare from squirt guns to soaked supremacy. The Super Soaker could drench opponents from across a yard and hold enough water for extended campaigns, making it the must-have weapon of every 1990s summer.
A plastic cone with a snorkel mouthpiece that let kids shout at each other underwater from fifteen feet away, invented in 1996 by an eleven-year-old from Moraga, California, who couldn't tell his dad about the fish while they snorkeled in Hawaii. He pitched Toys "R" Us from a fish tank, got an order for nearly 50,000, and sold the company at thirteen.