You're alone and you're just going about your casual business then that voice enters your head. You know that voice that just goes, screw it lets do some crazy stuff.
So Tara/Willow is alone and just having a nice sandwich for lunch. Then the voice speaks up. "Drop kick the sandwich." They are alone, no one will see and no one will ever know.
Who is more likely to follow the voice and drop kick the sandwich?
I'm voting for Willow. I bet she does it all the time, randomly sniffing banisters, only allowed to step on the path cracks with her left foot. see if she can fit her fist in her mouth while sitting in a lecture. The banana rebellion brought it out in her and now she cant stop.