Rocking Chair a.k.a Bottom

Tonight, Abby Jane was trying to stand on her truck, something she is yet to execute, but already knows it's a bad idea because she says "NOOOO!" while she tries.  Jake pointed out that it was good practice for surfing, but we told her to sit on her bottom anyways.  She kept standing up and trying to step up on the truck, so I asked, "Abby Jane, where is your bottom?"

She pointed to her rocking chair.

Of course.  Abby Jane is frequently standing in her rocking chair as well, and we always say, "Abby Jane, sit on your bottom!"  And she does.  Because evidently her rocking chair has an alias.  "Bottom."  Such simple reasoning, really.