We laugh and wriggle when someone tickles us. This is called as reflex action, an action, which takes place of which we are not aware of. Balancing ourselves when we walk is another example of reflex action. We retain our balance automatically, without thinking about it, but when we try to tickle ourselves we don’t laugh because our brain knows that we are going to do it and so there is no reflex action. So, do not tickle yourself, tickle others. Good luck!