First day in "big boy underwear"

Yesterday was my first day trying out big boy underwear. I was so excited to try them out. Mommy gave me the choice of "Cars", "Thomas the Train", or "Elmo." I decided to try the Elmo ones. They fit well and were comfortable so I went ahead and gave it a try. The morning went well. I stayed dry. The afternoon didn't go as well as I had hoped. I had two wets and one really dirty. Mommy decided to throw the last ones away. Then, last evening, I went back to a diaper. Today, we tried it again, and when Mommy asked me if I had to go to the bathroom, I told her I just did, but in my pants. I think that I just forget that I don't have a diaper on. I will get it. I know that I will.