Q: You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
When we tickle ourselves, our mind knows in advance that is supposed to happen. So we develop some sort of a defence to counter the effect of the tickle.
When somebody else tickles us suddenly our body is not prepared for that change of state.

Even if u hit urself (not too hard) it pains lesser than when some body else hits u suddenly.
A:
Why do we get tickled when somebody tickles us and we don't when we tickle ourselves?