Dad Makes Roller Coaster In Backyard (VIDEOS)

I don't know about this one!  I don't even like riding roller coasters at a fancy theme park!  I am a wuss! This morning, I was trying to figure out who this guy is and what the story was, when I found an article with more homemade coasters!  Check out the videos below!  Would you allow your kido on these?  Would you ride them?