What happens when you mix a group of bored, teenage boys, a challenging bet and a $50 budget?
For Austin Twede and Porter Harding, both 19 from Idaho Falls, Idaho, you wind up with a fully-functional 50-foot-long backyard roller coaster.
The original idea was the brainchild of Harding's mom, Lisa Harding, who bet the self-proclaimed "adrenaline junkies" they couldn't build a roller coaster in the backyard this past August for less than $50.
"Within 30 minutes we had rough plans written down on paper, thinking how much we could do with a $50 limit," Twede told GoodMorningAmerica.com. "We figured it could be about 50 feet long and 10 feet high."