Wipers.

Olive learns songs at school, and we sing a few with her at home.  I will admit to forgetting to that one verse of "The Wheels on the Bus" refers to its wipers.  Until my brother sent us this video (while we were out of town), we had not seen Olive's 'wipers'.  Her school is helping fill in the gaps when her Mommy and Daddy's childhood memories aren't terribly accurate ... :)

Enjoy!