If I tell DS "Don't do that, you'll break it!" he always replies "But look, I didn't - it's fine!" - and then continues to do it and seems to have no concept of the fact that he might break it in the future, because it didn't break the first time.
However, if he asks a question and the answer is "No", he will keep on asking it eleventymillion times in the hope that the answer might have changed.
AAAARGH. Please tell me your toddlers are all the same. Although I would also welcome any tips on getting them to accept the damn answer to the question the first time. I don't give in, BTW, so it's not that.