|People love tickling and being tickled|
Tests have been done to try and trick the brain into allowing the ticklish sensation when we try to do it. So far they have been unable to do so. People can even start laughing before they have been tickled by another person approaching with that clear objective. Something about the brain reacting to other people seems the basis for ticklishness. The fact that experts are puzzled by it shows how amazing our brain is. We scarcely know anything about it. The design behind it is pure genius.