A Half-wit 一个傻子
A young man was considered a half-wit in the village.
Wherever he was offered a choice between a dime and a nickel, he always chose the nickel. When this had gone on many times, a kind old man told him that a dime was worth twice as much as a nickel, so he should choose the dime in the future.
The half-wit said, "oh, I know the difference, but if I choose the dime, they'd stop offering me the choice and then I'd never even get the nickel."