Yup, there are preprogrammed biological responses inside of your body. Such as not being able to help, when someone slipped on ice and fell on their but(and more extreme examples).
It is important to recognize these in your youth(teens/twenties) and force yourself not to laugh when such things to happen, and your body is responding in a natural preprogrammed way.. at first such actions of not laughing will be forced, and will not be honest, but in time through constant reinforcement you can rewire your brain and eliminate certain biological responses from the "innate ones given to us by nature", for the ones we habituated through constant repetition.