Catching rabbits

As I buckled Annika into her car seat after dance class this morning, she propped her white tennis shoes up on the seat in front of her and said, "I am showing off my feet."
This quickly reminded me of the incident a week previous when Ariel was doing the same thing, bugging Dallin who sat in the front bench, so I found it necessary to nip this in the bud, and asked her to put them down. It seems like whenever I ask one child to stop doing something, another one sees an opportunity to get my attention, albeit negative, and does the same thing, so as I could have predicted, Adriana pops he feet up next to Annika's, as Annika asks, "Why?"
I had to come up with something quick, becasue I didn't want to remind them of how Ariel was bugging Dallin last week, and give them any ideas. The best I could come up with is that it is not polite, and I don't want it to become a bad habit, like putting your feet up on the table. At the same instant I was guiltily remembering how I like to put my feet up on the dashboard when we are driving long distances and I am in the passenger's seat. So, I am not only does that make me a hypocrite, but also a bad example. But I keep those thoughts to myself hoping they won't remember. Annika asks,"What is a habit?"
Relieved and the change in direction the conversation has taken, I explain that it is something you do all the time and a bad habit is something that you do a lot that you shouldn't, like biting your fingernails (something she does and we had been talking about earlier). To which she responds like she finally figured something out, "Oh, like catching rabbits?"
"Well, do you know anyone who catches rabbits all the time?"
"No."
"Me neither, so it's not really like that."

Maybe someday I will understand how her mind works. They put their feet down anyway, and I didn't even have to threaten or bribe.