A group of scientists placed 5 monkeys in a cage and in the middle, a ladder with bananas on the top.
Every time a monkey went up the ladder, the scientists soaked the rest of the monkeys with cold water.
After a while, every time a monkey went up the ladder, the others beat up the one on the ladder.
After some time, no monkey dare to go up the ladder regardless of the temptation.
Scientists then decided to substitute one of the monkeys.
The 1st thing this new monkey did was to go up the ladder. Immediately the other monkeys beat him up.
After several beatings, the new members learned not to climb the ladder even though the group never knew why.