>> and as fate has it, rowan happens to be at an age where loose teeth are in abundance. >> when rowan's front tooth became loose, ruby really wanted to do it. and i wasn't sure about it, so i pulled that out with a string and kind of imagined what that would be like to be pulled out by a motorcycle, and it really didn't seem that bad. it came out pretty easily. and as long as he gets the motion going from the right direction. >> i saw the video of my dad pulling it out like that and it made a crazy noise. and i was like, wait a minute, motorcycle. we should pull his tooth out with a motorcycle. >> of course! who wouldn't think of that? >> my dad was standing right there and i was like, dad, we should do it! >> when the next tooth over became loose, i was like, got it. let's see if you can do it. >> ruby hatches her scheme with dad's approval, but what about rowan? he is the guinea pig, after all. >> i wanted to do it, but when we were going to, i felt a little scared. you don't want to think about it too much.