Replace a wet monkey with a new dry monkey. When he spots the banana at the top of the stairs, he attempts to go for it- but to his surprise he gets jumped by all the other wet monkeys. Swap another wet monkey for a dry one, and the first dry monkey in the cage will join-in the beating of the newbie if he attempts to climb the stairs. He doesn't know why he is doing it but he will.
Replace another wet monkey with a dry one and he too will get a beating from all the others if he attempts to go up the stairs. Do this until all of the original wet monkeys are replaced with new ones......
No one will go up to get that banana now- and they don't even know why. They will just miss out.
'- ex NHS insider'