Why? Why? Why??

Why does a 2 1/2 year old know exactly how to push your buttons? Why won't they listen? Why do I have to be punished for THEIR bad behavior???? Whew. Okay, I obviously know the answer to all of these but I needed to get it out. Once again I had to leave a store because of my daughter's behavior. Unlike last time I did choose to check out, but that was ONLY because I had her prescription. If it hadn't been for that I would've drug her butt right out of there!! And it was Target, my favorite store. We had been having such a good time walking around and making her birthday list. And then it turned terribly wrong when she wanted a wagon filled with sand toys and I told her no. She didn't want to add it to her birthday list she wanted to take it home NOW. I keep telling her no and then she starts to hit me. OMG, oh no she didn't!! A fairly quiet ride home (since the tv was taken away from her) and I thought she had gotten over it. She apologized, said she was listening. And then we got home and it started all over again. One time out later and now it's blissful naptime. I don't think she's sleeping yet, but I don't care. She's in her room and being quiet. Right now I can't ask for much more than that!