"I don't have any legs!"

Or "I don't have any arms" is Mackenzie's new sayings! She must believe that if she doesn't have arms or legs that she gets out of doing something. That would be correct if it were true, but in the same sentence she is stomping her feet or fly her arms around. For example: "I can't pick up my toys because I don't have arms," or "I can't go get that for you mom because I don't have legs!" It must be a 4 yr old thing....... has anyone else experienced this? I try and not play along with her "game" and explain how she should be thankful that she actually does have arms and legs that do in fact work! She can be quit stubborn sometimes.......I don't know where she gets it from :)'