People who want to know things they are not supposed to ask about, are called 'Nieuwsgierige aapjes' - 'Curious monkeys / news-greedy (little) apes'. For example:
Jan vroeg aan Klaas waarom Kees boos was op Koen, waarop Jan antwoordde: 'Dat gaat je niets aan, nieuwsgierig aapje.'
Jan asked Klaas why Kees was angry with Koen, to which Jan responded: 'That is none of your business, curious little monkey'
my name is George, and people mistakenly take me for a monkey, even when i have no tail. i get myself into all kinds of trouble, yet never seem to receive the consequences of my actions; no punishments, just praise for discovering something that i am not the first to discover. (sometimes i am the first, and that just reels in even more praise)