Lily is my child who always says "I can't" (she is also my child who insists on wearing frilly dresses always). We had been trying for awhile to learn how to draw people with little success. One day we were outside playing with chalk and I look over to see heads with legs and faces. I assumed Halle had helped Lily with this little family, but Halle claimed she didn't help her at all.
Lily told me she drew our family. I wasn't convinced and made her show me she could do it, and what do you know she really could.
I think this "I can't" business is actually "I'll do it when I want" business.