After an inspiring trip to an amusement park, 10-year-old Lyle Pemble asked his dad Will if they could build a roller coaster at their home in Orinda, just outside San Francisco.
After some consideration, the father decided to take on the ambitious project.
"I thought about it for a second and the answer anyone expects is 'of course not'...but I said yes! I said sure!" he told ABC News.