Backyard roller coaster

A video of a three-year-old boy riding a backyard roller coaster built by what he no doubt thinks are the coolest parents ever has been making the rounds online.
The video--uploaded to YouTube in February--shows the boy whipping around the makeshift roller coaster as his father, Jon Cain, looks on.
The Lancaster, Ohio, couple, who own a local car dealership, built the roller coaster in 2009 on a whim, the boy's mother, Natasha Cain, told Yahoo
News.

"We thought, 'Why not? Let's make one,'" Cain said.
The 12-foot-high roller coaster--made of PVC tubing and concrete--took three weeks to build and cost $700, Cain said. "We thought it would cost about $300," she said. "But you can't have a half-built roller coaster."
She added that they cleared the coaster-construction plan with the city's board first. "They said, 'Go ahead, build it,'" Cain said.
But is it safe?
"I was concerned at first," Cain said. "But we test-rode it several times. And only my children are allowed on it."
The roller coaster is still standing, though the Cains are planning to dismantle it in order to sell their home.
Backyard roller coasters are not terribly uncommon, at least in the United States.
In 2010, Popular Mechanics gave an Oklahoma City man its coveted Backyard Genius award for his DIY roller coaster. His, though, sounds a little more elaborate than the Cains' creation: