Just about everything Sierra does is tied into something she has seen on a cartoon show, and she always has a toy friend with her, here is an example:
Last year for Christmas Sierra was given a toy roller coaster and she likes to pretend that she is Fanboy and Chum Chum (cartoon show) when she rides it. Spongebob (friend) is Fanboy and he is scared on the roller coaster while Sierra is Chum Chum who likes it. In the video she says "Weee" that is Chum Chum speaking, then she repeats the phrase "don't look down" and that is Fanboy speaking.
Most kids would just ride it and have fun, but with Sierra it always involves a show and/or a toy. I guess roller coasters are always more fun with a friend! Right?
I couldn't resist showing you this next video. It is Sierra's 10 month old sister Hannah, she is our little daredevil of the family and does this all by herself. She can't even walk yet. Pay no mind to the messy house, it was a long weekend due to ice and snow.