So, um… I’ve been wondering. 

What on earth is that thing behind Velma’s back?

We only see it in this one shot, and then it’s gone for the rest of the scene.

It’s not a chair, because if she was sitting, she wouldn’t be at her regular height… besides, her posture is so bizarre and straight, it doesn’t look like she’s sitting at all. 

Does she have a surfboard strapped to her back? Some kind of spine-straightening apparatus? A gigantic grape dried fruit snack? Help me out, here, guys!