We all love to surprise and delight our kids, but a mysterious YouTube Dad has really upped the joy factor.
In this homemade video, a little girl who looks to be about 5 or 6 squeals with laughter, yelling, "Again! Yeah! To the top, Dad!" as she's pushed to the top of a 12-foot drop — on her very own backyard roller coaster! The amazing contraption was built by her dad from PVC pipe, treated lumber, and "lots of concrete." Watch out, Phineas and Ferb!