1.) Bob has an old injury in his knee. Every time it rains, Bob's knee starts to hurt. One day, while sitting inside, Bob starts complaining that his knee hurts.
Obviously, that means it must be raining outside.

not necessarily. this is probably a psychological reaction to the rain.

Explanation:

Bob's knee hurts because Bob's wife hit him on the knee, because Bob complains about his knee instead of doing household chores.

through negative experiences we learn many things its sort of like karma if u do something bad to someone and u get a consequence u dont like the next time u wont do it again and as for positive ur not really learning anything and another example for negativity people didnt want barrack obama as president because they thought he was the worst and he was taking but now we have donald trump   and hes   is not anyone and shut down the government over sum petty stuff unlike barrack obama who shut down the government because they did not want to give health care to the community and now these people who want him out want him in now

it is a hope this 's