I think you got a lot of replies already that are in-line with what I would say.
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My DD is a very silly girl and she does like to explore those boundaries between acceptable/not acceptable. So I can totally see her doing something like escalating an "allowable" silliness into something that is really not acceptable. I though sapphire-chan's advice seemed good --to keep her interested/distracted by questions, add a little more control to scenarios where certain things must be accomplished, and not always open up the silliness door.
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In my case, though, I think sometimes I don't REALLY engage playfully in these scenarios, and DD can tell. I want DD to brush her teeth. She doesn't want to. I invent some game for the purpose of getting her to do what I want and then I get frustrated when she takes it to an extreme. Because what I really want is brushed teeth. What she wants is to play, and she's willing to brush some teeth along the way.
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For me, it sometimes helps to actually go a little nuts. Not allowing her to dip the toothbrush in the toilet. But. You know. Maybe she could brush the disgusting, green, mossy teeth of an imaginary unicorn named Dave. Maybe getting a little more into it and pushing things to a higher level of fancy/outrageousness will fulfill her need somewhat. Or keeping it an "I wish" or "I imagine" level instead of actually doing things that will then escalate to inappropriate behavior.
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About not playing cooperatively--while I agree that there are opportunities to teach sharing in situations like this, I also think that one of the ideas expressed in Playful Parenting is that we, as parents, aren't always tuned-in to the underlying agenda of a particular style of play. For instance, maybe your daughter likes to control the play, leaving you to basically do nothing but watch/interact with her, to put you in the position of petitioner and her in the position of decision-maker (no, you may not have any more beads) because that isn't what life is usually like for a 2-year old. Have you tried thinking up games that put her even more in a position of decision-making/leadership to see if that alleviates any of the behavior? I think our DDs are close to the same age and DD just started to understand follow-the-leader games. She also loves to pretend to do things that we do every-day, with herself in the role of decision maker...so we "cook" and she tells me which spoon to get, which bowl, which ingredient. She completely assumes control of both her role and my role, and I think that helps somewhat.
DD's favorite, all time, all day long activity is role-playing with animals/dolls/salt shakers/ketchup bottles, what have you, so another thing I might do is seize an opportunity to model the situation. One stuffed squirrel refusing to let the other stuff squirrel string beads. And then let her talk to me about how the squirrels feel. Ways that they could both string beads together. Etc.
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